java入门第三季，6-5课后作业

初学者，捣鼓出的一个作业，('')。

public void testSrot22() {
        List<String> stringList = new ArrayList<String>();
        for (int i = 0; i < 10; i++) {
            Random k = new Random();
            Integer k1 = k.nextInt(9) + 1;
            String num1 = "";
            for (int j = 0; j < k1; j++) {
                Random random = new Random();
                Integer num = random.nextInt(10);
                num1 += num;
            }
            stringList.add(num1);
        }
        for (String string : stringList)
            System.out.println(string);
    }