自动生成无重复的手机号码

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Andrew_Yuan/article/details/86553539

public class Test1 {
    public static void main(String[] args) {
        int num = 500;
        String first = "179";
        String second = "1111";
        List<String> telList = new ArrayList<>();
        for (int i = 0; i < num; i++) {
            String third = String.valueOf(getNum(1, 9100) + 10000).substring(1);
            String tel = first + second + third;
            telList.add(tel);
        }
        for (int j = 0; j < telList.size() - 1; j++) {
            for (int k = telList.size() - 1; k > j; k--) {
                if (telList.get(j).equals(telList.get(k))) {
                    telList.remove(k);
                }
            }
        }
        for (String te : telList) {
            System.out.println(te);
        }
        System.out.println(telList.size());
    }

    public static int getNum(int start, int end) {
        return (int) (Math.random() * (end - start + 1) + start);
    }
}