Java-继承，多态练习09-22-01

1．实现如下类之间的继承关系，并编写Music类来测试这些类。

父类：

package com.lianxi;

public class Instrument {
    //属性
    private String yueqi;

    public String getYueqi() {
        return yueqi;
    }

    public void setYueqi(String yueqi) {
        this.yueqi = yueqi;
    }
    //构造方法
    public Instrument(String yueqi)
    {
        this.yueqi=yueqi;
    }

    public Instrument() {
        super();
    }

    //成员方法
    public void play()
    {
        System.out.println("弹奏乐器名称："+yueqi);
    }
}

package com.lianxi;

public class Brass extends Instrument {

    //方法重写
        public void play()
        {
            System.out.println("弹奏Brass");
        }

        public void play2()
        {
            System.out.println("调用Barss的play2");
        }

}

package com.lianxi;

public class Wind extends Instrument {

    //方法重写
    public void play()
    {
        System.out.println("弹奏Wind");
    }

    public void play2()
    {
        System.out.println("调用Wind的play2");
    }
}

测试：

package com.lianxi;

public class Music {

    public static void main(String[] args) {
        Instrument ins=new Instrument();
        tune(ins);
        Wind w=new Wind();
        Brass b=new Brass();
        w.play();
        w.play2();
        b.play();
        b.play2();

    }
    public static void tune(Instrument i)
    {
        i.setYueqi("吉他");
        i.play();
        System.out.println(i.getYueqi());
    }

结果：