题解 | 密码强度等级

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);
        String password = in.nextLine();
        int score = 0;
        if (password.length() <= 4) {
            score += 5;
        } else if (password.length() >= 5 && password.length() <= 7) {
            score += 10;
        } else {
            score += 25;
        }
        char[] chars = password.toCharArray();
        int digit = 0;
        int bigLetter = 0;
        int smallLetter = 0;
        int other = 0;
        for (char c : chars) {
            if (Character.isDigit(c)) {
                digit++;
            } else if (Character.isLowerCase(c)) {
                smallLetter++;
            } else if (Character.isUpperCase(c)) {
                bigLetter++;
            } else {
                other++;
            }
        }
        if (smallLetter == 0 && bigLetter == 0) {
            score += 0;
        } else if ((smallLetter == 0 && bigLetter > 0) || (smallLetter > 0 &&
                   bigLetter == 0)) {
            score += 10;
        } else if (smallLetter > 0 && bigLetter > 0) {
            score += 20;
        }

        if (digit == 0) {
            score += 0;
        } else if (digit == 1) {
            score += 10;
        } else {
            score += 20;
        }

        if (other == 0) {
            score += 0;
        } else if (other == 1) {
            score += 10;
        } else {
            score += 25;
        }

        if (smallLetter > 0 && bigLetter > 0 && digit > 0 && other > 0) {
            score += 5;
        } else if (digit > 0 && other > 0 && (smallLetter > 0 || bigLetter > 0)) {
            score += 3;
        } else if (digit > 0 && (smallLetter > 0 || bigLetter > 0)) {
            score += 2;
        }

        if (score >= 90) {
            System.out.println("VERY_SECURE");
        } else if (score >= 80) {
            System.out.println("SECURE");
        } else if (score >= 70) {
            System.out.println("VERY_STRONG");
        } else if (score >= 60) {
            System.out.println("STRONG");
        } else if (score >= 50) {
            System.out.println("AVERAGE");
        } else if (score >= 25) {
            System.out.println("WEAK");
        } else if (score >= 0) {
            System.out.println("VERY_WEAK");
        }
    }
}