@Test

    public void aaa(){

        String[] sbNo = new String[]{"asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd"};

        int r = -1;

        for (int i = 0; i < 100; i++) {

            //1 多线程环境

            //r = ThreadLocalRandom.current().nextInt(sbNo.length) % sbNo.length;

            //2 普通的

            Random random = new Random();

            r = random.nextInt(sbNo.length);

            System.out.println(r);

        }

    }