// Cleanup and inheritance.

package thinkinginjava.polymorphism;

import static thinkinginjava.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();

}

}