test9.10

我把原来的程序删除了一部分，使得题目的目的更加明确，删掉的有adjust()和String toString()如果自己添加进去也可，有一点是String toString()不能写到接口里面

enum Note{MIDDLE_C,C_SHARP,B_FLAT;}

interface Playable{
void play(Note n);

}

class Wind implements Playable{
public void play(Note n){System.out.println("Wind.play+ "+n);}

}

class Percussion implements Playable{
public void play(Note n){System.out.println("Percussion.play+ "+n);}

}

class Stringed implements Playable{
public void play(Note n){System.out.println("Stringed.play+ "+n);}

}

class Brass extends Wind{
public void play(Note n){System.out.println("Brass.play+ "+n);}

}

class Woodwind extends Wind{
public void play(Note n){System.out.println("Woodwind.play+ "+n);}

}

public class Music10 {

public static void tune(Playable p)

{p.play(Note.MIDDLE_C);}

public static void tuneall(Playable []p)

{for(Playable pl:p)
tune(pl);}
public static void main(String[] args) {
Playable [] orchestra={
new Wind(),
new Percussion(),
new Stringed(),
new Brass(),
new Woodwind()
};
tuneall(orchestra);
}

}