java5

package bbb;

class Instrument {  public void play() {   System.out.println("开始弹奏！");  } } class wind extends Instrument{  public void play(){   System.out.println("弹奏wind！");    }     public void play2(){      System.out.println("弹奏wind的play2！");     } } class brass extends Instrument{  public void play(){   System.out.println("弹奏brass！");    }     public void play2(){      System.out.println("弹奏brass的play2！");     } }

public class Music {  public static void tune(Instrument i){   i.play();  }  public static void main (String args[]){   wind w=new wind();   tune(w);  }

}