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Fixed .gitignore for the last time.

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This commit is contained in:
Jacob Signorovitch
2024-11-05 19:54:44 -05:00
parent e21c403a27
commit e30b48deb2
101 changed files with 1 additions and 7533 deletions
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209
.metadata/.plugins/org.eclipse.core.resources/.history/17/80137ea4d59b001f1f5be468e8057a65
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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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@@ -1,223 +0,0 @@
package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
// Calculate the total age in human years of all humans and pets.
int totalHumanAge();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
public int totalHumanAge() { return 0; }
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
public int totalHumanAge() {
return this.first.totalAge() + this.rest.totalHumanAge();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
// Sum of age and pet's age (in human years).
int totalAge() {
return this.age + this.pet.humanAge();
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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@@ -1,227 +0,0 @@
package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
boolean testTotalAge(Tester t) {
return t.checkExpect(horb.totalAge(), 408 + 9);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
// Calculate the total age in human years of all humans and pets.
int totalHumanAge();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
public int totalHumanAge() { return 0; }
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
public int totalHumanAge() {
return this.first.totalAge() + this.rest.totalHumanAge();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
// Sum of age and pet's age (in human years).
int totalAge() {
return this.age + this.pet.humanAge();
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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@@ -1,228 +0,0 @@
package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
boolean testTotalHumanAge(Tester t) {
return t.checkExpect(unpopulated.totalHumanAge(), 0)
&& t.checkExpect(onlyHorb.totalHumanAge(), hekOlder.humanAge() + horb.age);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
// Calculate the total age in human years of all humans and pets.
int totalHumanAge();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
public int totalHumanAge() { return 0; }
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
public int totalHumanAge() {
return this.first.totalAge() + this.rest.totalHumanAge();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
// Sum of age and pet's age (in human years).
int totalAge() {
return this.age + this.pet.humanAge();
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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@@ -1,248 +0,0 @@
package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPetGetName(Tester t) {
return t.checkExpect(hek.getName(), new YesString("Hek"))
&& t.checkExpect(unpet.getName(), new NoString())
&& t.checkExpect(foot.getName(), new YesString("Foot"));
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.hasPet() && s.equals(this.pet.getName().unwrap());
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Return the name of the pet (maybe).
IMaybeString getName();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
public class Main {
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
// Calculate the age in human years.
int humanAge();
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
// Calculate the total age in human years of all humans and pets.
int totalHumanAge();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
public int totalHumanAge() { return 0; }
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
public int totalHumanAge() {
return this.first.totalAge() + this.rest.totalHumanAge();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
// Calculate the total age in human years of all humans and pets.
int totalHumanAge();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPetGetName(Tester t) {
return t.checkExpect(hek.getName(), new YesString("Hek"))
&& t.checkExpect(unpet.getName(), new NoString())
&& t.checkExpect(foot.getName(), new YesString("Foot"));
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPetGetName(Tester t) {
return t.checkExpect(hek.getName(), new YesString("Hek"))
&& t.checkExpect(unpet.getName(), new NoString())
&& t.checkExpect(foot.getName(), new YesString("Foot"));
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.hasPet() && s.equals(this.pet.getName().unwrap());
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.hasPet() && this.name.equals(this.pet.getName().unwrap());
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Return the name of the pet (maybe).
IMaybeString getName();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}

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eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
org.eclipse.jdt.core.compiler.compliance=21
org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
org.eclipse.jdt.core.compiler.release=enabled
org.eclipse.jdt.core.compiler.source=21

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPetGetName(Tester t) {
return t.checkExpect(hek.getName(), new YesString("Hek"))
&& t.checkExpect(unpet.getName(), new NoString())
&& t.checkExpect(foot.getName(), new YesString("Foot"));
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.hasPet() && s.equals(this.pet.getName().unwrap());
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.hasPet() && this.name.equals(this.pet.getName().unwrap());
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Return the name of the pet (maybe).
IMaybeString getName();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}

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eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
org.eclipse.jdt.core.compiler.compliance=21
org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
org.eclipse.jdt.core.compiler.release=enabled
org.eclipse.jdt.core.compiler.source=21

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPetGetName(Tester t) {
return t.checkExpect(hek.getName(), new YesString("Hek"))
&& t.checkExpect(unpet.getName(), new NoString())
&& t.checkExpect(foot.getName(), new YesString("Foot"));
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.hasPet() && s.equals(this.pet.getName().unwrap());
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.hasPet() && this.name.equals(this.pet.getName().unwrap());
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Return the name of the pet (maybe).
IMaybeString getName();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}

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package mastermind;
public class Main {
}

0
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@@ -1,236 +0,0 @@
package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPetGetName(Tester t) {
return t.checkExpect(hek.getName(), new YesString("Hek"))
&& t.checkExpect(unpet.getName(), new NoString())
&& t.checkExpect(foot.getName(), new YesString("Foot"));
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.hasPet() && s.equals(this.pet.getName().unwrap());
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.hasPet() && this.name.equals(this.pet.getName().unwrap());
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Return the name of the pet (maybe).
IMaybeString getName();
// Age of pet in human years.
int humanAge();
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
boolean testTotalHumanAge(Tester t) {
return t.checkExpect(unpopulated.totalHumanAge(), 0)
&& t.checkExpect(onlyHorb.totalHumanAge(), 2457);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
// Calculate the total age in human years of all humans and pets.
int totalHumanAge();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
public int totalHumanAge() { return 0; }
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
public int totalHumanAge() {
return this.first.totalAge() + this.rest.totalHumanAge();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
// Sum of age and pet's age (in human years).
int totalAge() {
return this.age + this.pet.humanAge();
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name? This would be better implemented as an
// abstract class, but in keeping with the spirit of the assignment, it
// shall reside in the interface.
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.pet.hasName(s);
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.pet.hasName(this.name);
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 6;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public int humanAge() {
return this.age * 7;
}
public boolean hasName(String name) {
return name.equals(this.name);
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public int humanAge() { return 0; }
public boolean hasName(String name) { return false; }
}

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package delegation;
import tester.Tester;
class Examples {
IPet foot = new Dog("Foot", 44);
IPet footOlder = new Dog("Foot", 45);
IPet hek = new Cat("Hek", 408);
IPet hekOlder = new Cat("Hek", 409);
IPet unpet = new NoPet();
IPet stephenDog = new Dog("Stephen", 93);
Person horb = new Person("Horb", hek, 9);
Person horbOlder = new Person("Horb", hekOlder, 10);
Person minge = new Person("Minge", unpet, 3);
Person mingeOlder = new Person("Minge", unpet, 4);
Person wrist = new Person("Wrist", foot, 60);
Person wristOlder = new Person("Wrist", footOlder, 61);
Person stephenPerson = new Person("Stephen", stephenDog, 88);
ILoPerson unpopulated = new MtLoPerson();
ILoPerson onlyHorb = new ConsLoPerson(horb, unpopulated);
ILoPerson mingeAndHorb = new ConsLoPerson(minge, onlyHorb);
ILoPerson mingeAndHorbOneYearLater =
new ConsLoPerson(mingeOlder,
new ConsLoPerson(horbOlder, unpopulated));
ILoPerson mingeAndStephen = new ConsLoPerson(minge, new ConsLoPerson(stephenPerson, unpopulated));
boolean testPetOlder(Tester t) {
return t.checkExpect(foot.older(), footOlder)
&& t.checkExpect(hek.older(), hekOlder)
&& t.checkExpect(unpet, unpet);
}
boolean testPersonOlder(Tester t) {
return t.checkExpect(horb.older(), horbOlder)
&& t.checkExpect(minge.older(), mingeOlder)
&& t.checkExpect(wrist.older(), wristOlder);
}
boolean testPetGetName(Tester t) {
return t.checkExpect(hek.getName(), new YesString("Hek"))
&& t.checkExpect(unpet.getName(), new NoString())
&& t.checkExpect(foot.getName(), new YesString("Foot"));
}
boolean testPersonSamePetName(Tester t) {
return t.checkExpect(horb.samePetName("Hek"), true)
&& t.checkExpect(horb.samePetName("Minkus"), false)
&& t.checkExpect(minge.samePetName("8"), false);
}
boolean testILoPersonOlder(Tester t) {
return t.checkExpect(unpopulated.older(), unpopulated)
&& t.checkExpect(mingeAndHorb.older(), mingeAndHorbOneYearLater);
}
boolean testPetHumanAge(Tester t) {
return t.checkExpect(hek.humanAge(), 2448)
&& t.checkExpect(stephenDog.humanAge(), 651)
&& t.checkExpect(unpet.humanAge(), 0);
}
boolean testPersonPetHasSameName(Tester t) {
return t.checkExpect(wrist.petHasSameName(), false) &&
t.checkExpect(minge.petHasSameName(), false) &&
t.checkExpect(stephenPerson.petHasSameName(), true);
}
boolean testAnyNarcissists(Tester t) {
return t.checkExpect(mingeAndHorbOneYearLater.anyNarcissists(), false) &&
t.checkExpect(mingeAndStephen.anyNarcissists(), true);
}
}
// A list of people.
interface ILoPerson {
// Increase each member person's and their pet's ages by one.
ILoPerson older();
// Does anyone share a name with their pet?
boolean anyNarcissists();
}
class MtLoPerson implements ILoPerson {
public ILoPerson older() { return this; };
public boolean anyNarcissists() { return false; };
}
class ConsLoPerson implements ILoPerson {
Person first;
ILoPerson rest;
ConsLoPerson(Person first, ILoPerson rest) {
this.first = first;
this.rest = rest;
}
public ILoPerson older() {
return new ConsLoPerson(this.first.older(), this.rest.older());
}
public boolean anyNarcissists() {
return this.first.petHasSameName() || this.rest.anyNarcissists();
}
}
//a pet owner
class Person {
String name;
IPet pet;
int age; // in years
Person(String name, IPet pet, int age) {
this.name = name;
this.pet = pet;
this.age = age;
}
// Increase the age of a person and their pet by one year.
Person older() {
return new Person(this.name, this.pet.older(), this.age + 1);
}
// Do they have a pet (and not an unpet)?
boolean hasPet() {
return this.pet.isPet();
}
// Whether a person's pet's name's the same as the given string.
boolean samePetName(String s) {
return this.hasPet() && s.equals(this.pet.getName().unwrap());
}
// Return whether they've the same name their pet.
boolean petHasSameName() {
return this.hasPet() && this.name.equals(this.pet.getName().unwrap());
}
}
//a pet
interface IPet {
// Increase the age of a pet by one year.
IPet older();
boolean isPet();
// Return the name of the pet (maybe).
IMaybeString getName();
// Age of pet in human years.
int humanAge();
// Does the pet have the given name?
boolean hasName(String name);
}
//a pet cat
class Cat implements IPet {
String name;
int age; // in years
Cat(String name, int age) {
this.name = name;
this.age = age;
}
public Cat older() {
return new Cat(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 6;
}
}
//a pet dog
class Dog implements IPet {
String name;
int age; // in years
Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog older() {
return new Dog(this.name, this.age + 1);
}
public boolean isPet() { return true; }
public IMaybeString getName() {
return new YesString(this.name);
}
public int humanAge() {
return this.age * 7;
}
}
//no pet
class NoPet implements IPet {
public NoPet older() { return this; }
public boolean isPet() { return false; }
public IMaybeString getName() { return new NoString(); }
public int humanAge() { return 0; }
}
// Maybe a string.
interface IMaybeString {
boolean isString();
String unwrap();
}
// No string.
class NoString implements IMaybeString {
public boolean isString() { return false; }
// This is an exception and should cause the program to crash, but I don't know how to do that cleanly.
public String unwrap() { int i = 0/0; return "what have you done 😔"; };
}
// Yes string.
class YesString implements IMaybeString {
String s;
YesString(String s) { this.s = s; }
public boolean isString() { return true; }
public String unwrap() { return this.s; }
}