java类的多态编程。 （1）乐器（Instrument）分为：钢琴(Piano)、小提琴(Vio

public class Instrument {   

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public void play(){

System.out.println("演奏乐器......");

}

}

public class Piano extends Instrument{

public void play(){

System.out.println("弹奏钢琴......");

}

}

public class Violin extends Instrument{

public void play(){

System.out.println("演奏小提琴......");

}

}

public class TestPlay {

public static void main(String[] args) {

Instrument pr = new Instrument();

pr.play();

Instrument p = new Piano();

p.play();

Instrument v = new Violin();

v.play();

}

}

java三种乐器弹奏方法不同……源代码

　/**

* 歌曲类

*/

public class Music {

public Music() {

super();

}

public Music(String song) {

super();

System.out.println("《"+song+"》");

System.out.println(".....多来米发所拉稀....");

}

}

/**

* 乐器接口，凡实现该接口的都游演奏的功能

*/

public interface Instrument {

public Music musical(String song);

}

/**

* 管弦类乐器

*/

public class Orchestral implements Instrument {

public Music musical(String song) {

System.out.println("下面用管弦类乐器演奏 "+song);

return new Music(song);

}

}

/**

* 弹奏类乐器

*/

public class Spiccato implements Instrument {

public Music musical(String song) {

System.out.println("下面用弹奏类乐器弹奏 "+song);

return new Music(song);

}

}

/**

* 其他类型乐器

*/

public class Other implements Instrument {

String instrument;

public Other() {

super();

}

public Other(String instrument) {

this.instrument = instrument;

}

public Music musical(String song) {

System.out.println("用 "+instrument+" 演奏的 "+song);

return new Music(song);

}

public static void main(String[] args) {

Other other = new Other("古筝");

other.musical("高山流水");

}

}

/**

* 笛子

*/

public class Fife extends Orchestral {

public Fife(String song) {

super.musical(song);

System.out.println("这是用横笛吹奏的 "+song);

}

}

/**

* 萨克斯

*/

public class Sax extends Orchestral {

public Sax(String song) {

super.musical(song);

System.out.println("这是用萨克斯演奏的 "+song);

}

}

/**

* 吉他

*/

public class Guitar extends Spiccato {

public Guitar(String song) {

super.musical(song);

System.out.println("这是吉他弹奏的");

}

}

/**

* 钢琴

*/

public class Piano extends Spiccato {

public Piano() {

super();

}

public Piano(String song) {

super.musical(song);

System.out.println("这是在用钢琴弹奏 "+song);

}

}

教我写下小代码吧 java

interface Instrument{

void play();

}

class Piano implements Instrument{

public void play() {

System.out.println("play Piano");

}

}

class Violin implements Instrument{

public void play() {

System.out.println("play Violin");

}

}

public class InstrumentTest{

public static void main(String[] args) {

Instrument i1 = new Piano();

Instrument i2 = new Violin();

i1.play();

i2.play();

}

}

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