code pushed for subtype polymorphism lecture

inheritance3/DIY/DogLauncher.java

@@ -0,0 +1,10 @@
+public class DogLauncher {
+    public static void main(String[] args) {
+        Dog d1 = new Dog("Elyse", 3);
+        Dog d2 = new Dog("Sture", 9);
+        Dog d3 = new Dog("Benjamin", 15);
+        Dog[] dogs = new Dog[]{d1, d2, d3};
+        System.out.println(Maximizer.max(dogs));
+        Dog d = (Dog) Maximizer.max(dogs);
+    }
+}

inheritance3/DIY/Maximizer.java

@@ -9,11 +9,4 @@ public static Object max(Object[] items) {
 		return items[maxDex];
 
 	}
-
-	public static void main(String[] args) {
-		Dog[] dogs = {new Dog("Elyse", 3), new Dog("Sture", 9),
-		             new Dog("Artemesios", 15)};
-		Dog maxDog = (Dog) max(dogs);
-		maxDog.bark();
-	}
 } 

inheritance3/live/Dog.java

@@ -1,3 +1,5 @@
+import java.util.Comparator;
+
 public class Dog implements Comparable<Dog> {
     private String name;
     private int size;
@@ -11,6 +13,12 @@ public void bark() {
         System.out.println(name + " says: bark");
     }
 
+    public static class NameComparator implements Comparator<Dog> {
+        public int compare(Dog d1, Dog d2) {
+            return d1.name.compareTo(d2.name);
+        }
+    }
+
     /** Returns negative number if this dog is less than the dog pointed at by o, and so forth. */
     public int compareTo(Dog uddaDog) {
         return this.size - uddaDog.size;

inheritance3/live/DogLauncher.java

@@ -1,3 +1,5 @@
+import java.util.Comparator;
+
 public class DogLauncher {
     public static void main(String[] args) {
         Dog d1 = new Dog("Elyse", 3);
@@ -6,5 +8,12 @@ public static void main(String[] args) {
         Dog[] dogs = new Dog[]{d1, d2, d3};
         System.out.println(Maximizer.max(dogs));
         Dog d = (Dog) Maximizer.max(dogs);
+
+        Comparator<Dog> cd = new Dog.NameComparator();
+        if (cd.compare(d1, d3) > 0) {
+            d1.bark();
+        } else {
+            d3.bark();
+        }
     }
 }

inheritance3/live/Maximizer.java

@@ -8,6 +8,5 @@ public static Comparable max(Comparable[] items) {
 			}
 		}
 		return items[maxDex];
-
 	}
 }

inheritance3/pauly/Dog.java

@@ -0,0 +1,13 @@
+public class Dog {
+    private String name;
+    private int size;
+
+    public Dog(String n, int s) {
+        name = n;
+        size = s;
+    }
+
+    public void bark() {
+        System.out.println(name + " says: bark");
+    }
+}

inheritance3/pauly/DogLauncher.java

@@ -0,0 +1,10 @@
+public class DogLauncher {
+    public static void main(String[] args) {
+        Dog d1 = new Dog("Elyse", 3);
+        Dog d2 = new Dog("Sture", 9);
+        Dog d3 = new Dog("Benjamin", 15);
+        Dog[] dogs = new Dog[]{d1, d2, d3};
+        System.out.println(Maximizer.max(dogs));
+        Dog d = (Dog) Maximizer.max(dogs);
+    }
+}

inheritance3/pauly/Maximizer.java

@@ -0,0 +1,12 @@
+public class Maximizer {
+	public static Object max(Object[] items) {
+		int maxDex = 0;
+		for (int i = 0; i < items.length; i += 1) {
+			if (items[i] > items[maxDex]) {
+				maxDex = i;                 
+			}
+		}
+		return items[maxDex];
+
+	}
+} 

inheritance3/pauly/TODO.md

@@ -0,0 +1 @@
+Create a new interface that allows the Maximizer.max method to do its job on ANY object implementing that interface.