Updated Abstractions.

abstraction/src/abstraction/Main.java

@@ -3,15 +3,33 @@ package abstraction;
 import tester.Tester;
 
 class Examples {
-    ILoStrings someWords = new ConsString("feldspar", new ConsString("assignment", new ConsString("curb", new LastString("carpet"))));
+
+    ILoStrings someWords = new ConsString(
+        "feldspar",
+        new ConsString(
+            "assignment",
+            new ConsString("curb", new LastString("carpet"))
+        )
+    );
 
     boolean tests(Tester t) {
-        return t.checkExpect(someWords.earliest(new OrderByShortness()), "curb")
+        return (
-                && t.checkExpect(someWords.earliest(new OrderByAlpha()), "assignment")
+            t.checkExpect(someWords.earliest(new OrderByShortness()), "curb") &&
-                && t.checkExpect(someWords.earliest(new OrderByOrder()), "feldspar")
+            t.checkExpect(
-                && t.checkExpect(someWords.earliest(new OrderByLongness()), "assignment")
+                someWords.earliest(new OrderByAlpha()),
-                && t.checkExpect(someWords.earliest(new OrderByUnalpha()), "feldspar")
+                "assignment"
-                && t.checkExpect(someWords.earliest(new OrderByDisorder()), "carpet");
+            ) &&
+            t.checkExpect(someWords.earliest(new OrderByOrder()), "feldspar") &&
+            t.checkExpect(
+                someWords.earliest(new OrderByLongness()),
+                "assignment"
+            ) &&
+            t.checkExpect(
+                someWords.earliest(new OrderByUnalpha()),
+                "feldspar"
+            ) &&
+            t.checkExpect(someWords.earliest(new OrderByDisorder()), "carpet")
+        );
     }
 }
 
@@ -20,56 +38,83 @@ interface IStringsBefore {
 }
 
 // Negates an ordering.
-class Disorder {
+class Disorder implements IStringsBefore {
+
     IStringsBefore ordering;
 
-    Disorder(IStringsBefore ordering) { this.ordering = ordering; }
+    Disorder(IStringsBefore ordering) {
+        this.ordering = ordering;
+    }
 
-    boolean after(String s1, String s2) {
+    public boolean before(String s1, String s2) {
-        return ! this.ordering.before(s1, s2);
+        return !this.ordering.before(s1, s2);
     }
 }
 
-class OrderByShortness implements IStringsBefore { public boolean before(String s1, String s2) {
+class OrderByShortness implements IStringsBefore {
-    return s1.length() <= s2.length();
-}}
 
-class OrderByAlpha implements IStringsBefore { public boolean before(String s1, String s2) {
+    public boolean before(String s1, String s2) {
-    return s1.compareTo(s2) <= 0;
+        return s1.length() <= s2.length();
-}}
+    }
+}
 
-class OrderByOrder implements IStringsBefore { public boolean before(String s1, String s2) {
+class OrderByAlpha implements IStringsBefore {
-    return true;
-}}
 
-class OrderByLongness implements IStringsBefore { public boolean before(String s1, String s2) {
+    public boolean before(String s1, String s2) {
-    return new Disorder(new OrderByShortness()).after(s1, s2);
+        return s1.compareTo(s2) <= 0;
-}}
+    }
+}
 
-class OrderByUnalpha implements IStringsBefore { public boolean before(String s1, String s2) {
+class OrderByOrder implements IStringsBefore {
-    return new Disorder(new OrderByAlpha()).after(s1, s2);
-}}
 
-class OrderByDisorder implements IStringsBefore { public boolean before(String s1, String s2) {
+    public boolean before(String s1, String s2) {
-    return new  Disorder(new OrderByOrder()).after(s1, s2);
+        return true;
-}}
+    }
+}
+
+class OrderByLongness implements IStringsBefore {
+
+    public boolean before(String s1, String s2) {
+        return new Disorder(new OrderByShortness()).before(s1, s2);
+    }
+}
+
+class OrderByUnalpha implements IStringsBefore {
+
+    public boolean before(String s1, String s2) {
+        return new Disorder(new OrderByAlpha()).before(s1, s2);
+    }
+}
+
+class OrderByDisorder implements IStringsBefore {
+
+    public boolean before(String s1, String s2) {
+        return new Disorder(new OrderByOrder()).before(s1, s2);
+    }
+}
 
 // A non-empty list of strings.
 interface ILoStrings {
-    String val();                               // Gets the value.
+    String val(); // Gets the value.
-    String earliest(IStringsBefore ordering);   // Gets the earliest in a list of strings.
+    String earliest(IStringsBefore ordering); // Gets the earliest in a list of strings.
     String earliestHelper(IStringsBefore ordering, String prev);
 }
 
 abstract class ALoStrings implements ILoStrings {
+
     String val;
 
-    ALoStrings(String val) { this.val = val; }
+    ALoStrings(String val) {
+        this.val = val;
+    }
 
-    public String val() { return this.val; }
+    public String val() {
+        return this.val;
+    }
 }
 
 class ConsString extends ALoStrings {
+
     ILoStrings nxt;
 
     ConsString(String val, ILoStrings nxt) {
@@ -78,7 +123,9 @@ class ConsString extends ALoStrings {
     }
 
     public String earliest(IStringsBefore ordering) {
-        return ordering.before(this.val, this.nxt.val()) ? this.nxt.earliestHelper(ordering, this.val) : this.nxt.earliest(ordering);
+        return ordering.before(this.val, this.nxt.val())
+            ? this.nxt.earliestHelper(ordering, this.val)
+            : this.nxt.earliest(ordering);
     }
 
     public String earliestHelper(IStringsBefore ordering, String prev) {
@@ -87,7 +134,16 @@ class ConsString extends ALoStrings {
 }
 
 class LastString extends ALoStrings {
-    LastString(String val) { super(val); }
+
-    public String earliest(IStringsBefore ordering) { return this.val; }
+    LastString(String val) {
-    public String earliestHelper(IStringsBefore ordering, String prev) { return prev; }
+        super(val);
+    }
+
+    public String earliest(IStringsBefore ordering) {
+        return this.val;
+    }
+
+    public String earliestHelper(IStringsBefore ordering, String prev) {
+        return prev;
+    }
 }