main方法程序代碼：

package com.bdqn;public class PetTest {public static void main(String[] args) {Master master = new Master();Pet dog = new Dog();dog.setName("黑鼻");dog.setHealth(88);dog.setLove(78);((Dog) dog).setStrain(1);dog.print();dog.play();System.out.println("**********************");Pet penguin = new Penguin();penguin.setName("QQ");penguin.setHealth(77);penguin.setLove(76);((Penguin) penguin).setSex(1);penguin.print();penguin.play();} }

主人類代碼：

package com.bdqn;public class Master {public void playWithPet(Pet pet){if(pet instanceof Dog){Dog dog = (Dog)pet;dog.play();}else if(pet instanceof Penguin){Penguin penguin = (Penguin) pet;penguin.play();}} }

Pet類代碼：

package com.bdqn;public abstract class Pet {private String name;private int health;private int love;public void setName(String name) {this.name = name;}public String getName() {return name;}public void setHealth(int health) {if(health < 0 || health > 100){health = 60;}this.health = health;}public int getHealth() {return health;}public void setLove(int love) {if(love < 0 || love > 100){love = 60;}this.love = love;}public int getLove() {return love;}public void print(){System.out.println("寵物的自白：");System.out.print("我的名字叫"+getName()+"，健康值是"+getHealth()+"，和主人的親密度是"+getLove());}public abstract void play(); }

Dog類代碼：

package com.bdqn;public class Dog extends Pet{private String strain;public String getStrain() {return strain;}public void setStrain(int strain) {if(strain == 1){this.strain = "拉布拉多";return;}this.strain = "博美";}public void print(){super.print();System.out.println(",我的種類是："+this.getStrain());}public void play() {System.out.println("扔飛碟出去，狗狗跑去撿回來......");}public void toHospital(){System.out.println("打針、吃藥");super.setHealth(60);} }

Penguin類代碼：

package com.bdqn;public class Penguin extends Pet{private String sex;public String getSex() {return sex;}public void setSex(int sex) {if(sex == 1 ){this.sex = "Q仔";return;}this.sex = "Q妹";}public void print(){super.print();System.out.println("，我的性別是："+this.getSex());}public void play() {System.out.println("帶企鵝去南極游泳......");} }

程序運行結果：

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轉載于:https://www.cnblogs.com/yangwenxiang/p/10299573.html

總結

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