java 继承练习题1

Posted 2020-07-10 风起，唯有努力生存

package com.lianxi;

public class Instrument {
    public void play()
    {
        System.out.println("弹奏乐器");
    }

}

package com.lianxi;

public class Wind extends Instrument {
    public void play()
    {
        System.out.println("弹奏Wind");
    }
    public void play2()
    {
        System.out.println("调用Wind的play2");
    }

}

package com.lianxi;

public class Brass extends Instrument {
    public void play()
    {
        System.out.println("弹奏brass");
    }

    public void play2()
    {
        System.out.println("调出brass的play2");
    }
}

package com.lianxi;

public class Music {
    //调用对象I的play
    
    public static void tune(Instrument i)
    {
        i.play();
    }
    
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
  
        //调用turn方法，以Wind类对象为参数
        Wind w=new Wind();
        
        tune(w);
        //调用turn方法，以Brass类对象为参数
        Brass b=new Brass();
        tune(b);
        
    }