Added ability to eat a fish

* Added a field to track hunger on Penguin
* Added a Fish class
* Updated hunger when the penguin is fed a fish

Author: colabug

src/animals/Fish.java

@@ -0,0 +1,14 @@
+package animals;
+
+/**
+ * Author: Corey Leigh Latislaw
+ * Date: 7/29/12
+ * Purpose: GDI classroom example
+ */
+public class Fish extends Animal
+{
+    public Fish()
+    {
+        System.out.println( "Creating a fish" );
+    }
+}

src/animals/Penguin.java

@@ -17,6 +17,8 @@ public class Penguin extends Animal
     Foot leftFoot;
     Beak beak;
 
+    boolean isHungry;
+
     public Penguin( int age,
                     int weight,
                     String leftEyeColor,
@@ -31,6 +33,8 @@ public Penguin( int age,
         this.age = age;
         this.weight = weight;
 
+        isHungry = true;
+
         // Construct new objects from parameters
         leftEye = new Eye( leftEyeColor );
         rightEye = new Eye( rightEyeColor );
@@ -52,4 +56,10 @@ public void swim()
         rightFoot.flap();
         leftFoot.flap();
     }
+
+    public void eat( Fish fish )
+    {
+        System.out.println( "Swimming" );
+        isHungry = false;
+    }
 }