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 str=in.nextLine();
        int length=str.length();
        int score=0;
        boolean hasLower=false;
        boolean hasUpper=false;
        int digitCount=0;
        int symbolCount=0;
        for(int i=0;i<str.length();i++){
            if(Character.isLowerCase(str.charAt(i))){
                hasLower=true;
            }else if(Character.isUpperCase(str.charAt(i))){
                hasUpper=true;
            }else if(Character.isDigit(str.charAt(i))){
                digitCount++;
            }else if(calculateSymbol(str.charAt(i))){
                symbolCount++;
            }
        }

        // length
        int lengthScore=scoreByLength(length);

        // charact
        int characterScore=0;
        if(hasLower&&hasUpper){
            characterScore=20;
        }else if(hasLower||hasUpper){
            characterScore=10;
        }

        //num
        int numScore=0;
        if(digitCount==1){
            numScore=10;
        }else if(digitCount>1){
            numScore=20;
        }

        //symbol
        int symbolScore=0;
        if(symbolCount==1){
            symbolScore=10;
        }else if(symbolCount>1){
            symbolScore=25;
        }

        // award
        int awardScore=0;
        if(hasLower&&hasUpper&&digitCount>0&&symbolCount>0){
            awardScore=5;
        }else if((hasLower||hasUpper)&&digitCount>0&&symbolCount>0){
            awardScore=3;
        }else if((hasLower||hasUpper)&&digitCount>0){
            awardScore=2;
        }

        int resultScore=lengthScore+characterScore+numScore+symbolScore+awardScore;
        if(resultScore>=90){
            System.out.println("VERY_SECURE");
        }else if(resultScore>=80){
            System.out.println("SECURE");
        }else if(resultScore>=70){
            System.out.println("VERY_STRONG");
        }else if(resultScore>=60){
            System.out.println("STRONG");
        }else if(resultScore>=50){
            System.out.println("AVERAGE");
        }else if(resultScore>=25){
            System.out.println("WEAK");
        }else if(resultScore>=0){
            System.out.println("VERY_WEAK");
        }
    }

    public static int scoreByLength(int length){
        if(length<=4){
            return 5;
        }else if(length<=7){
            return 10;
        }else{
            return 25;
        }
    }
    public static boolean calculateSymbol(char a){
        if((a>=0x21&&a<=0x2F)||(a>=0x3A&&a<=0x40)||(a>=0x5B&&a<=0x60)||(a>=0x7B&&a<=0x7E)){
            return true;
        }
        return false;
    }
}