1.继承--day09_08_继承中方法的覆盖重写_应用场景

编写父类Phone.java

package com.iflytek.day09.demo06;

public class Phone {
    
    
    public void call(){
    
    
        System.out.println("打电话");
    }
    public void send(){
    
    
        System.out.println("发短信");
    }
    public void show(){
    
    
        System.out.println("显示电话");
    }
}

编写子类NewPhone.java

package com.iflytek.day09.demo06;

// 定义一个新手机，使用老手机作为父类
public class NewPhone extends Phone {
    
    
//这里因为继承了父类Phone，直接写show+回车即可自动生成
    @Override
    public void show() {
    
    
        super.show(); // 把父类的show方法拿过来重复利用
        // 自己子类再来添加更多内容
        System.out.println("显示姓名");
        System.out.println("显示头像");
    }
}

编写主类Demo01Phone.java

package com.iflytek.day09.demo06;

public class Demo01Phone {
    
    
    public static void main(String[] args) {
    
    
        Phone phone = new Phone();
        phone.call();
        phone.send();
        phone.show();
        System.out.println("==========");

        NewPhone newPhone = new NewPhone();
        newPhone.call();
        newPhone.send();
        newPhone.show();
    }
}