题解 | #字符串加密#

import java.util.Arrays;
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 secret = in.nextLine();
        String pwd = in.nextLine();

        //初始化
        boolean[] initArray = new boolean[26];
        char[] chs1 = new char[26];
        int i = 0; 
        for(char ch : secret.toLowerCase().toCharArray()){
            int index = ch - 'a';
            if(initArray[index]){
                continue;
            }
            initArray[index] = true;
            chs1[i++]=ch;
        }
        for(int j = 0; j< initArray.length;j++){
            if(!initArray[j]){
                chs1[i++] = (char)('a'+j);
            }
        }

        StringBuilder result = new  StringBuilder();
        for(char ch : pwd.toCharArray()){
            if(ch >= 'a' && ch <= 'z'){
                int index = ch - 'a';
                result.append(chs1[index]);
            }else if(ch >= 'A' && ch <= 'Z'){
                int distance = 'a' - 'A';
                int index = ch - 'a' + distance;
                char pwdChar = (char)(chs1[index]-distance);
                result.append(pwdChar);
            }else{
                result.append(ch);
            }
        }
        System.out.println(result.toString());
    }
}