package fkw;

public class music {  public static void tune(instrument i){   i.play();  }

public static void main(String args[]){  music m=new music();  wind w=new wind();  brass b=new brass();  m.tune(w);  m.tune(b); } }

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

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

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