题解 | 密码强度等级

import java.util.*;
import java.lang.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static int lenJudge(String pwd){
        int len = pwd.length();
        if (len<=4) return 5;
        else if (len<=7) return 10;
        else return 25;
    }

    public static int charJudge(String pwd){
        StringBuffer sb_small = new StringBuffer();
        StringBuffer sb_big= new StringBuffer();
        for(int i=0;i<26;i++){
            sb_small.append((char)(65+i));
            sb_big.append((char)(97+i));
        }
        String sSmall = sb_small.toString(), sBig = sb_big.toString();
        boolean has_small = false, has_big = false;
        for(int i=0;i<pwd.length();i++){
            if(sSmall.contains(pwd.substring(i,i+1))) has_small = true;
            if(sBig.contains(pwd.substring(i,i+1))) has_big = true;
        }
        if(has_big && has_small) return 20;
        else if (has_big || has_small) return 10;
        else return 0;
    }

    public static int numJudge(String pwd){
        String nums = "0123456789";
        int cnt = 0;
        for(int i=0;i<pwd.length();i++){
            if(nums.contains(pwd.substring(i,i+1))) cnt+=1;
        }
        if(cnt<=0) return 0;
        else if (cnt==1) return 10;
        else return 20;
    }

    public static int fJudge(String pwd){
        String cList = "!\"#$%&'()*+,-./:;<=>?@:;<=>?@[\\]^_`{|}~";
        int cnt = 0;
        for(int i=0;i<pwd.length();i++){
            if(cList.contains(pwd.substring(i,i+1))) cnt+=1;
        }
        if(cnt<=0) return 0;
        else if(cnt==1) return 10;
        else return 25;
    }

    public static String finalRes(int score){
        if(score>=90) return "VERY_SECURE";
        else if (score>=80) return "SECURE";
        else if (score>=70) return "VERY_STRONG";
        else if (score>=60) return "STRONG";
        else if (score>=50) return "AVERAGE";
        else if (score>=25) return "WEAK";
        else return "VERY_WEAK";
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String pwd = in.nextLine();

            int score = 0;
            score+=lenJudge(pwd);
            int charScore = charJudge(pwd);
            score+=charScore; //*
            int numScore = numJudge(pwd);
            score+=numScore; //*
            int fScore = fJudge(pwd);
            score+=fScore; //*
    
            if(charScore==20 && numScore>0 && fScore>0) score+=5;
            else if (charScore==10 && numScore>0 && fScore>0) score+=3;
            else if (charScore>0 && numScore>0 && fScore==0) score+=2;
            // System.out.println(score);
            System.out.println(finalRes(score));
        }
    }
}

模拟题，纯粹靠细心