5月5号打卡

Posted 2021-11-27 lvzhiqi

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！");
}
}