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//: polymorphism/Frog.java

// Cleanup and inheritance.

package polymorphism;

import static net.mindview.util.Print.*;

class Characteristic {

private String s;

Characteristic(String s) {

this.s = s;

print("Creating Characteristic " + s);

}

protected void dispose() {

print("disposing Characteristic " + s);

}

}

class Description {

private String s;

Description(String s) {

this.s = s;

print("Creating Description " + s);

}

protected void dispose() {

print("disposing Description " + s);

}

}

class LivingCreature {

private Characteristic p =

new Characteristic("is alive");

private Description t =

new Description("Basic Living Creature");

LivingCreature() {

print("LivingCreature()");

}

protected void dispose() {

print("LivingCreature dispose");

t.dispose();

p.dispose();

}

}

class Animal extends LivingCreature {

private Characteristic p =

new Characteristic("has heart");

private Description t =

new Description("Animal not Vegetable");

Animal() { print("Animal()"); }

protected void dispose() {

print("Animal dispose");

t.dispose();

p.dispose();

super.dispose();

}

}

class Amphibian extends Animal {

private Characteristic p =

new Characteristic("can live in water");

private Description t =

new Description("Both water and land");

Amphibian() {

print("Amphibian()");

}

protected void dispose() {

print("Amphibian dispose");

t.dispose();

p.dispose();

super.dispose();

}

}

public class Frog extends Amphibian {

private Characteristic p = new Characteristic("Croaks");

private Description t = new Description("Eats Bugs");

public Frog() { print("Frog()"); }

protected void dispose() {

print("Frog dispose");

t.dispose();

p.dispose();

super.dispose();

}

public static void main(String[] args) {

Frog frog = new Frog();

print("Bye!");

frog.dispose();

}

} /* Output:

Creating Characteristic is alive

Creating Description Basic Living Creature

LivingCreature()

Creating Characteristic has heart

Creating Description Animal not Vegetable

Animal()

Creating Characteristic can live in water

Creating Description Both water and land

Amphibian()

Creating Characteristic Croaks

Creating Description Eats Bugs

Frog()

Bye!

Frog dispose

disposing Description Eats Bugs

disposing Characteristic Croaks

Amphibian dispose

disposing Description Both water and land

disposing Characteristic can live in water

Animal dispose

disposing Description Animal not Vegetable

disposing Characteristic has heart

LivingCreature dispose

disposing Description Basic Living Creature

disposing Characteristic is alive

*///:~