父类作为方法形参实现多态（父类作为返回值）待加

Posted 2022-04-28 lev1

宠物类

package com.pangui;
//父类
public  class CongWu 
    private String name = "无名氏";
    private int health ;
    private int love;
//    public CongWu() 
//        //无参构造方法
//    
    public CongWu(String name,int health,int love) 
        //带参构造方法
        this.name = name;
        if(health < 0||health > 100) 
            //System.out.println("健康值应在0-100之间，默认值为60");
            this.health = 60;
        else 
            this.health = health;
        
        if(love>100||love<0) 
            //System.out.println("请密度应在0-100之间，默认值为60");
            this.love = 60;
        else 
            this.love = love;
        
//        this.health = health;
//        this.love = love;
    
    //无参构造方法和有参构造方法的作用??????????????????
    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;
    
    public int getLove() 
        return love;
    
    public void setLove(int love) 
        this.love = love;
    
    //显示信息
    public void show() 
        System.out.println("宠物的自白：\\n我的名字叫"+this.name+"，我与主人的亲密度是"+this.love+"，健康值"+ this.health+"。");
    
    public void Play()
        
    
    public void bath() 
        System.out.println("主人在为"+this.getName()+"洗澡");
    
    public void eat() 
    

狗类

package com.pangui;
//狗类
public  class Dog extends CongWu
        private String strain;
//        public Dog()                       //无参构造
//        
        public Dog(String name,int health,int love,String strain) 
            super(name,health,love);
            this.strain = strain;
            
        
        public String getStrain() 
            return strain;
        
        public void setStrain(String strain) 
            this.strain = strain;
        
        public void show()                          //重写
            super.show();     
            System.out.println("我是一只"+this.getStrain()+"狗");// ？？？？？？？？？？？？
        
        public void xizao() 
            System.out.println(this.getName()+"在洗澡");
        
        public void Play()
            System.out.println(this.getName()+"在玩蛇");
        
        public void eat() 
            if(this.getHealth() == 100) 
                System.out.println("狗狗"+this.getName()+"吃饱了，不需要喂食");
            else 
                System.out.println("狗狗"+this.getName()+"吃根骨头");
                this.setHealth(this.getHealth()+3);
            
        
        public void catchFly() 
            System.out.println("狗狗叼飞碟");
        

企鹅类

package com.pangui;
//企鹅类
public  class QiE extends CongWu 
    private String sex;
//    public QiE() 
//    
    public QiE(String name,int health,int love,String sex) 
        super(name,health,love);
        this.sex = sex;
        
    public String getSex() 
        return sex;
    
    public void setSex(String sex) 
        this.sex = sex;
    
    public void show() 
        super.show();
        System.out.println("我的性别是"+this.getSex());
    
    public void Play()
        System.out.println(this.getName()+"在玩水");
    
    public void eat() 
        if(this.getHealth() == 100) 
            System.out.println("企鹅"+this.getName()+"吃饱了，不需要喂食");
        else 
            System.out.println("企鹅"+this.getName()+"吃小鱼");
            this.setHealth(this.getHealth()+5);
        
    

主人类

package com.pangui;
//主人类
public class Master 
       public void game(CongWu congwu)      //方法形参
          congwu.Play(); 
        
       public void feed(CongWu congwu) 
            congwu.eat();
       
//       public Dog shower() 
//           Dog dog = null;
//                      
//        return dog;
//       
       

 

测试类

package com.pangui;
//测试类
public class Test 
        public static void main(String[] args) 
             Master master = new Master();
            CongWu dog = new Dog("多多",100,87,"哈士奇");//向上转型
            master.feed(dog);
            master.game(dog);    
            Dog d = (Dog)dog;//向下转型
            d.catchFly();
            CongWu qie = new QiE("豆豆",87,56,"Q仔");
            master.feed(qie);
            master.game(qie);
            
          //System.out.println(master.shower()); 
           
        

还得继续完善