题解 | #密码验证合格程序#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in  = new Scanner(System.in);
        while (in.hasNextLine()) {
            String pwd = in.nextLine();
            if (pwd.length() > 8 && !isContainCommonString(pwd) && contain3Type(pwd)) {
                System.out.println("OK");
            } else {
                System.out.println("NG");
            }
        }
    }
    static boolean contain3Type(String pwd) {
        int number = 0;
        int lowChar = 0;
        int upperChar = 0;
        int others = 0;
        for (char c : pwd.toCharArray()) {
            if (c >= '0' && c <= '9') {
                number = 1;
            } else if (c >= 'a' && c <= 'z') {
                lowChar = 1;
            } else if (c >= 'A' && c <= 'Z') {
                upperChar = 1;
            } else {
                others = 1;
            }
        }
        return number + lowChar + upperChar + others >= 3;
    }
    static boolean isContainCommonString(String str) {
        for (int i = 0; i < str.length()-3; i++) {
            String child = str.substring(i, i + 3);
            if (str.substring(i + 2).contains(child)) {
                return true;
            }
        }
        return false;
    }
}