1. 题目

读题

考查点

2. 解法

思路

代码逻辑

具体实现

public class HJ020 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            System.out.println(check(sc.nextLine()) ? "OK" : "NG");
        }

    }

    public static boolean check(String pwd) {
        if (pwd.length() <= 8) {
            return false;
        }


        boolean[] flags = new boolean[4];
        for (char c : pwd.toCharArray()) {
            if (c >= 'a' && c <= 'z') {
                flags[0] = true;
            } else if (c >= 'A' && c <= 'Z') {
                flags[1] = true;
            } else if (Character.isDigit(c)) {
                flags[2] = true;
            } else if (!flags[3]) {
                flags[3] = true;
            }
        }
        int cnt = 0;
        for (boolean flag : flags) {
            if (flag) cnt++;
        }
        if (cnt < 3) {
            return false;
        }

        for (int i = 0; i < pwd.length() - 5; i++) {
            for (int j = i + 3; j < pwd.length() - 2; j++) {
                if (pwd.substring(i, i + 3).equals(pwd.substring(j, j + 3))) {
                    return false;
                }
            }
        }

        return true;

    }
}

3. 总结