题解 | #密码强度等级#

import java.util.Scanner;
import java.util.regex.Matcher;
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);
        String pwd = in.nextLine();
        int score = 0;
        //奖励标志位，分别表示大写字母，小写字母，数字，符号
        int[] reward = {0, 0, 0, 0};
        // 长度
        if (pwd.length() >= 8){
            score += 25;
        }else if (pwd.length() >= 5){
            score += 10;
        }else{
            score += 5;
        }
        // 字母
        Matcher matcher = Pattern.compile("(?=.*[a-z])(?=.*[A-Z])").matcher(pwd);
        Matcher matcher1 = Pattern.compile("[a-z]+|[A-Z]+").matcher(pwd);
        if (matcher.find()){ //字母大小混合
            score += 20;
            reward[0] = reward[1] = 1;
        }else if (matcher1.find()){ //只有大写字母或者小写字母
            score += 10;
            reward[0] = 1; //只有大写或者小写字母时计大写字母标志位为1
        } //没有字母不加分

        //数字
        Matcher matcher2 = Pattern.compile("\\d").matcher(pwd);
        int count = 0;
        while (matcher2.find()){
            count++;
        }
        if (count == 1){ // 只有1个数字
            score += 10;
            reward[2] = 1;
        }else if(count > 1){ //多个数字
            score += 20;
            reward[2] = 1;
        }

        //符号
        String regex = "[!\"#$%&'()*+,-./:;<=>?@\\[\\]^_`{|}~]";
        Matcher matcher3 = Pattern.compile(regex).matcher(pwd);
        count = 0;
        while (matcher3.find()){
            count++;
        }
        if (count == 1){ // 只有1个符号
            score += 10;
            reward[3] = 1;
        }else if(count > 1){ //多个符号
            score += 25;
            reward[3] = 1;
        }

        //奖励
        if (reward[0] == 1 && reward[1] == 1 && reward[2] == 1 && reward[3] == 1){
            score += 5;
        }else if (reward[0] == 1 && reward[2] == 1 && reward[3] == 1){
            score += 3;
        }else if (reward[0] == 1 && reward[2] == 1){
            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 {
            System.out.println("VERY_WEAK");
        }
    }
}