题解 | #密码验证合格程序#

正则表达式

import java.util.Scanner;
import java.util.regex.Pattern;

// 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);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String passWord = in.nextLine();
            System.out.println(checkePassWord(passWord) ? "OK" : "NG");
        }
    }
    public static boolean checkePassWord(String str) {
        if (str.length() <= 8) return false;
        int count = 0;
        Pattern patternUpperCase = Pattern.compile("[A-Z]");
        if (patternUpperCase.matcher(str).find()) count = count + 1;
        Pattern patternLowerCase = Pattern.compile("[a-z]");
        if (patternLowerCase.matcher(str).find()) count = count + 1;
        Pattern patternDigit = Pattern.compile("[0-9]");
        if (patternDigit.matcher(str).find()) count = count + 1;
        Pattern patternOther = Pattern.compile("[^a-zA-Z0-9]");
        if (patternOther.matcher(str).find()) count = count + 1;
        if (count < 3) return false;
        for (int i = 0; i < str.length() - 2; i++) {
            String shortStr = str.substring(i, i + 3);
            String longStr = str.substring(i + 3);
            if (longStr.contains(shortStr)) return false;
        }
        return true;
    }
}