package com.mufeng.theeighthchapter;

class Characteristic {// 特征
	private String s;

	public Characteristic(String s) {
		// TODO Auto-generated constructor stub
		this.s = s;
		System.out.println("Creating Characteristic " + s);
	}

	protected void dispose() {
		System.out.println("disposing Characteristic " + s);
	}
}

class Description {// 描述
	private String s;

	public Description(String s) {
		// TODO Auto-generated constructor stub
		this.s = s;
		System.out.println("Creating Description " + s);
	}

	protected void dispose() {
		System.out.println("disposing Description " + s);
	}
}

class LivingCreature {// 生物
	private Characteristic p = new Characteristic("is alive");
	private Description t = new Description("Basic Living Creature");

	public LivingCreature() {
		// TODO Auto-generated constructor stub
		System.out.println("LivingCreature()");
	}

	protected void dispose() {
		System.out.println("LivingCreature dispose");
		t.dispose();
		p.dispose();
	}
}

class Animal extends LivingCreature {// 动物
	private Characteristic p = new Characteristic("has heart");
	private Description t = new Description("Animal not Vegetable");

	public Animal() {
		// TODO Auto-generated constructor stub
		System.out.println("Animal()");
	}

	protected void dispose() {
		System.out.println("Animal dispose");
		t.dispose();
		p.dispose();
		super.dispose();
	}
}

class Amphibian extends Animal {// 两栖动物
	private Characteristic p = new Characteristic("can live in water");
	private Description t = new Description("Both water and land");

	public Amphibian() {
		// TODO Auto-generated constructor stub
		System.out.println("Amphibian()");
	}

	protected void dispose() {
		System.out.println("Amphibian dispose");
		t.dispose();
		p.dispose();
		super.dispose();
	}
}

public class Frog extends Amphibian {// 青蛙
	private Characteristic p = new Characteristic("Croaks");
	private Description t = new Description("Eats Bugs");

	public Frog() {
		// TODO Auto-generated constructor stub
		System.out.println("Frog()");
	}

	protected void dispose() {
		System.out.println("Frog dispose");
		t.dispose();
		p.dispose();
		super.dispose();
	}

	public static void main(String[] args) {
		Frog frog = new Frog();
		System.out.println("Bye!");
		frog.dispose();
	}

}

输出结果

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