多态-典型用法

package 多态.典型用法;
/*
* 宠物 父类
* */
public  abstract class Pet {
    private int health;//健康

    public int getHealth() {
        return health;
    }

    public void setHealth(int health) {
        this.health = health;
    }
    //宠儿生病去医院
    public  abstract void toHopsoital();
    public  abstract void eat();
}

package 多态.典型用法;
/*
* 狗类
* */
public class Dog extends Pet {

    @Override
    public void toHopsoital() {
            System.out.println("打针");
            System.out.println("吃药");
            //狗的治疗健康度+3
            int old = this.getHealth();
            this.setHealth(old+3);

        }

     public void jiefeipan(){
         System.out.println("接飞盘");
     }

    @Override
    public void eat() {
        System.out.println("狗吃屎");
        int old = this.getHealth();
        this.setHealth(old+30);
    }
}

package 多态.典型用法;
/*
* 企鹅
* */
public class Penguin extends Pet {
    @Override
    public void toHopsoital() {

//        System.out.println("打针");
            System.out.println("吃药");
            //企鹅的治疗健康度+5
            int old = this.getHealth();
            this.setHealth(old+5);
    }

    public void qianshui(){
        System.out.println("潜水");
    }

    @Override
    public void eat() {
        System.out.println("企鹅吃毛线");
        int old = this.getHealth();
        this.setHealth(old+50);
    }
}

package 多态.典型用法;
/*
* snake类
* */
public  class  Snake extends Pet {

    @Override
    public void toHopsoital() {
        System.out.println("打针");
        System.out.println("吃药");
        //狗的治疗健康度+3
        int old = this.getHealth();
        this.setHealth(old+6);
    }
    @Override
    public void eat() {
        System.out.println("你就啥都吃不到" );
        int old = this.getHealth();
        this.setHealth(old+60);
    }
}

package 多态.典型用法;

/*
 *对象 instanceof 类或接口
 * 判断对象是否是该类的对象，如果是返回true,不是返回false
 *
 * */
public class Master {
    //
    void cure(Pet pet) {  //赋值是父类 传参传的类型是子类对象   相当于Pet pet=dog  Pet是父类 dog是子类
        pet.toHopsoital();
        //想调用子类独有的方法
        //如果传进来的类型
        if (pet instanceof Dog) {
            ((Dog) pet).jiefeipan();
        } else if (pet instanceof Penguin) {
            ((Penguin) pet).qianshui();
        }
    }

    void eat(Pet pet){
        pet.eat();
    }
}

package 多态.典型用法;

/*
* 不用多态 增加一种宠物类
*
* */
public class Test {
    public static void main(String[] args) {
        Master master = new Master();
//
        Dog dog =new Dog();
        dog.setHealth(22);
        master.cure(dog); // Pet pet=dog
        System.out.println("治疗后健康度是"+dog.getHealth());

        Penguin penguin =new Penguin();
        penguin.setHealth(19);
        master.cure(penguin);
        System.out.println("治疗后健康度是"+penguin.getHealth());


        Snake snake =new Snake();
        snake.setHealth(19);
        master.cure(snake);
        System.out.println("治疗后健康度是"+snake.getHealth());

        master.eat(dog);
        System.out.println("健康度是"+dog.getHealth());
        master.eat(penguin);
        System.out.println("健康度是"+penguin.getHealth());
        master.eat(snake);
        System.out.println("健康度是"+snake.getHealth());


    }


    }