java 继承练习题2

Posted 2020-07-10 风起，唯有努力生存

创建如下三个类：（People类中的三个方法分别输出一些信息，ChinaPeople

和AmericanPeople类重写父类的三个方法）。

 

package com.hanqi;

public class People {
    private double height;
    private double weight;
    public double getHeight() {
        return height;
    }
    public void setHeight(double height) {
        this.height = height;
    }
    public double getWeight() {
        return weight;
    }
    public void setWeight(double weight) {
        this.weight = weight;
    }
    //打招呼
    public void speakHello()
    {
        System.out.println("Hello!");
    }

}

package com.hanqi;
//extends 继承
//Object 是所有类的父类】
public class ChinaPeople extends People {

    public void gongfu()
    {
        System.out.println("站如松");
    }
    public void speakHello()
    {
        System.out.println("你好");
    }

}

package com.hanqi;

public class AmericanPeople extends People {
    //输出拳击的信息
    public void americanBoxing()
    {
        System.out.println("直拳，勾拳");
        }

}

package com.hanqi;

public class Testpeople {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根

        People p=new People();
        p.speakHello();
        
        ChinaPeople cp=new ChinaPeople();
        cp.setWeight(100);
        
        cp.setHeight(100);
        System.out.println(cp.getHeight());
        cp.speakHello();
        cp.gongfu();
        AmericanPeople  a=new AmericanPeople();
        a.americanBoxing();
        
    }

}