Pet类
package com.aaa.adv;/** * 父类：宠物类 * @author 张晨光 * */public class Pet { //成员变量 private String name; private int health; //public Pet(){} //构造 public Pet(String name, int health) { super(); this.name = name; this.health = health; } //生成getter/setter; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getHealth() { return health; } public void setHealth(int health) { this.health = health; } //增加一个方法：eat public void eat(){ System.out.println("宠物类开始虚拟的吃"); } //针对公共的方法，一定要学会提取出来 public void eat(String food){ System.out.println(this.getName()+"吃"+food); } }Cat类
package com.aaa.adv;public class Cat extends Pet { public Cat(String name, int health) { super(name, health); } }Dog类
package com.aaa.adv;public class Dog extends Pet { public Dog(String name, int health) { super(name, health); // TODO Auto-generated constructor stub } //Dog子类，本身仍然保留了父类的eat()不带参数的方法 //子类，增加了一个参数;不再是重写的方法;// public void eat(String food){// System.out.println("小狗吃"+food);// }}Parrot类
package com.aaa.adv;/** * 鹦鹉类 * @author 张晨光 * */public class Parrot extends Pet { public Parrot(String name, int health) { super(name, health); } }Rat类
package com.aaa.adv;public class Rat extends Pet { public Rat(String name, int health) { super(name, health); // TODO Auto-generated constructor stub }}Master类
package com.aaa.adv;/** * 主人类：姓名 性别 地址 电话 ，本身是不是没有食物的属性; * @author 张晨光 * */public class Master { //成员变量； //喂养狗;方法（动物，食物）// public void feed(Dog dog,String food){// dog.eat(food);// } //喂养猫// public void feed(Cat cat,String food){// cat.eat(food);// } //要喂养鹦鹉，需要再次增加鹦鹉的喂养方法;// public void feed(Parrot par,String food){// par.eat(food);// } //上面的两个方法，就是上次课说的方法的重载;重载在一个类里面；重写多个类; public void feed(Pet pet,String food){ pet.eat(food); } public static void main(String[] args) { //maindog cat自动去eat; Dog dog=new Dog("旺财狗",100); Cat cat=new Cat("花脸猫",100); //增加一个主人类;主人来喂养狗和猫. Master master=new Master(); master.feed(dog,"排骨"); master.feed(cat,"猫粮"); //***********增加 Parrot p=new Parrot("金刚 ",100); master.feed(p, "瓜子"); Rat rat=new Rat("米老鼠",100); master.feed(rat, "木屑"); }}图示：
