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 sc = new Scanner(System.in);

        while (sc.hasNextLine()){
            String s = sc.nextLine();
            if(validPassword(s)){
                System.out.println("OK");
            }else{
                System.out.println("NG");
            }
        }
    }

    private static boolean validPassword(String s){

        if(s.length() <= 8){
            return false;
        }

        int fourCondition = 0;

        boolean hasUpper = false;
        boolean hasLower = false;
        boolean hasDigit = false;
        boolean hasOther = false;
        for (char ch : s.toCharArray()) {
            if (Character.isUpperCase(ch)) {
                hasUpper = true;
            } else if (Character.isLowerCase(ch)) {
                hasLower = true;
            } else if (Character.isDigit(ch)) {
                hasDigit = true;
            } else if (ch >= 33 && ch <= 126) {
                hasOther = true;
            }
        }
        if (!(hasUpper && hasLower && hasDigit) && !(hasUpper && hasLower && hasOther) &&
                !(hasUpper && hasDigit && hasOther) && !(hasLower && hasDigit && hasOther)) {
            return false;
        }

        for (int i = 0; i < s.length() - 2; i++) {
            String substr = s.substring(i, i + 3);
            if (s.indexOf(substr, i + 3) != -1) {
                return false;
            }
        }
        return true;
    }
}