java多态深入理解(二)

package bean;
// 乐器类
class MusicInstruments1{
public void play(){
System.out.println("play music");
}
}
// 笛子类继承乐器类
class Flute1 extends MusicInstruments{
public void play(){
System.out.println("flute play music");
}
}
// 钢琴类继承乐器类
class Piano1 extends MusicInstruments{
public void play(){
System.out.println("piano play music");
}
}

public class DuoTai1 {
public static void Instruments(MusicInstruments instruments){
instruments.play();
}
public static void main(String[] args) {
MusicInstruments f = new Flute();
Instruments(f);
}
}