package com.niuke_1; class NoThisSoundException extends Exception{ public NoThisSoundException(){ super(); } public NoThisSoundException(String x){ super(x); } } class Player{ public void player(int index) throws NoThisSoundException{ if (index>10){ NoThisSoundException no = new NoThisSoundException("您播放的歌曲不存在"); throw no; } } } public class demo_5 { public static void main(String[] args){ Player pl = new Player(); try{ pl.player(21); }catch (NoThisSoundException no){ System.out.println(no.getMessage()); } } }