package bbb; public 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"); } }
package bbb; public class Music { public static void tune(Instrument i){ i.play(); } public static void main(String[] args){ Instrument i=new Instrument(); i.play(); wind w=new wind(); tune(w); w.play2(); Brass b=new Brass(); tune(b); b.play2(); //Music m=new Music();
//m.tune(b);
//m.tune(w);
} }
运行结果: