跳出指定的循环
Scanner input = new Scanner(System.in); outer: while (true) { System.out.println("您是要查询年份1,举办地2,还是冠军国3,退出请输入0:"); int num = input.nextInt(); switch (num) { case 0: System.out.println("退出成功!"); break outer;// 退出while循环 case 1: System.out.println("请输入查询的年份:"); int year = input.nextInt(); for (City city : list) { if (year == city.getYear()) { System.out.println(city); } } break; default: break; } }