java的继承

package Music;

public class Music {

public void tune(Instrument i){

i.play();

}

public static void main(String args[]){

Music a=new Music();

Instrument d=new Instrument();

a.tune(d);

Wind b =new Wind();

b.play2();

a.tune(b);

Brass c=new Brass();

a.tune(c);

c.play2();

}

}

package Music;

public class Instrument {

public void play() {

// TODO 自动生成的方法存根

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");

}

}

 

public class E {

public void main(String[] args) {

// TODO 自动生成的方法存根

Monkey b =new Monkey();

b.speak();

Poeple c =new Poeple();

c.speak();

c.think();

}

}

class Monkey {

public void speak(){

System.out.println("咿咿呀呀......");

}

}

class Poeple extends Monkey{

public void speak(){

System.out.println("小样的，不错嘛！会说话了！");

}

public void think(){

System.out.println("别说话！认真思考！");

}

}