polymorphism

Author: amartid

src/ClassHoldObj/Fish.java

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+package ClassHoldObj;
+
+public class Fish extends Animal{}

src/Polymorphism1/e55Polymorphism.java

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+package Polymorphism1;
+
+import javax.swing.*;
+
+//assume that pacman eats food like cherries, bananas, strawberries
+//superclass is Polymorphism1.pacFood
+//cherries, bananas, strawberries inherit all methods and variables on food class - subclasses
+
+public class e55Polymorphism extends JFrame{
+    public static void main(String [] args){
+        //Polymorphism1.pacCherry cherry  =  new Polymorphism1.pacCherry();
+        // cherry is reference variable
+        // cherry is object of a type Polymorphism1.pacCherry
+        //Polymorphism1.pacFood cherry2  =  new Polymorphism1.pacCherry(); // anything that inherits from superclass can be assigned to cherry2
+        //polymoprphic array
+        pacFood bucky[] = new pacFood[2];
+        bucky[0] = new pacCherry();
+        bucky[1] = new pacBanana();
+        //variables are of Polymorphism1.pacFood class
+        for(int x=0; x<2; ++x ){
+            bucky[x].eat();
+        //no need to create an object of every type
+        }
+    }
+}

src/Polymorphism1/pacBanana.java

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+package Polymorphism1;
+
+public class pacBanana extends pacFood{
+	public void eat() {
+
+		System.out.println("This Banana is great");
+	}
+}

src/Polymorphism1/pacCherry.java

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+package Polymorphism1;
+
+public class pacCherry extends pacFood{
+	public void eat() {
+
+		System.out.println("This Cherry is great");
+	}
+}

src/Polymorphism1/pacFood.java

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+package Polymorphism1;
+
+public class pacFood {
+	public void eat() {
+
+		System.out.println("This food is great");
+	}
+}

src/Polymorphism1/pacStrawnerrie.java

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+package Polymorphism1;
+
+public class pacStrawnerrie extends pacFood{
+	public void eat() {
+
+		System.out.println("This Strawberry is great");
+	}
+}

src/Polymorphism2/pacman.java

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+package Polymorphism2;
+
+public class pacman extends pacFood {
+	public void digest(pacFood x) { //pass a food object
+		x.eat(); // i can also pass subclasses objects of pacFood Superclass
+	}
+}

src/Polymorphism3/e57Polymorphism.java

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+package Polymorphism3;
+
+import javax.swing.*;
+
+//assume that pacman eats food like cherries, bananas, strawberries
+//superclass is Polymorphism1.pacFood
+//cherries, bananas, strawberries inherit all methods and variables on food class - subclasses
+//overwriting -> same argument as superclass
+//same arguments on overwriting - consistency in subclasses
+//also cannot change scope-visibility
+//overloading is when i change the arguments
+public class e57Polymorphism extends JFrame{
+    public static void main(String [] args){
+        pacman mypacman = new pacman();
+        pacFood fo = new pacFood();
+        pacFood so = new pacStrawnerrie();
+        mypacman.digest(fo);
+        mypacman.digest(so);
+    }
+}

src/Polymorphism3/pacBanana.java

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+package Polymorphism3;
+
+public class pacBanana extends pacFood {
+	public void eat() {
+
+		System.out.println("This Banana is great");
+	}
+}

src/Polymorphism3/pacCherry.java

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+package Polymorphism3;
+
+public class pacCherry extends pacFood {
+	public void eat() {
+
+		System.out.println("This Cherry is great");
+	}
+}