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;
            }

        }