java基础自定义测试异常类

书上的课后题，我觉得有用就把放这里了

class NoThisSongException extends Exception {
    public NoThisSongException() {
        super();
    }
    public NoThisSongException(String str) {
        super(str);
    }
}
class Player {
    public void play(int index) throws NoThisSongException{
        if(index>10){
            throw new NoThisSongException("您播放的歌曲不存在");
        } else {
            System.out.println("歌曲"+index+"已经播放");
        }
    }
}
public class test3 {
    public static void main(String[] args) {
        Player p1 = new Player();
        try{
            p1.play(5);
            p1.play(11);
        }catch(NoThisSongException e){
            System.out.println(e.getMessage());
        }
    }
}