T3、编写程序实现乐手弹奏乐器。乐手可以弹奏不同的乐器从而发出不同的声音。可以弹奏的乐器包括二胡、钢琴和琵琶。要求:
- 定义乐器类Instrument,包括方法makeSound()
- 定义乐器类的子类:二胡Erhu、钢琴Piano和小提琴Violin
- 定义乐手类Musician,可以弹奏各种乐器play(Instrument instrument)
- 定义测试类,给乐手不同的乐器让他弹奏。
public class Instrument {//父类
public void makeSound(){
System.out.println("乐器发出声音");
}
}
public class Erhu extends Instrument{//子类1
public void makeSound() {
System.out.println("乐手弹奏二胡,发出二胡声");
}
}
public class Piano extends Instrument{//子类2
public void makeSound() {
System.out.println("乐手弹奏钢琴,发出钢琴声");
}
}
public class Violin extends Instrument{//子类3
public void makeSound() {
System.out.println("乐手弹奏小提琴,发出小提琴声");
}
}
public class Musician {//乐手类
//类Musician 有方法play(Instrument instrument)
public void play(Instrument instrument){
instrument.makeSound();
}
}
public class TestMusic {//测试类
public static void main(String[] args) {
Musician musician = new Musician();
Erhu erhu = new Erhu();
Piano piano = new Piano();
Violin violin = new Violin();
musician.play(erhu);
musician.play(piano);
musician.play(violin);
}
}