题解 | #字符串加解密#

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while (scan.hasNext()) {
            String s1 = scan.nextLine();
            String s2 = scan.nextLine();
            String res1 = encrypt(s1);
            String res2 = decrypt(s2);
            System.out.println(res1);
            System.out.println(res2);
        }
    }
    //加密
    public static String encrypt(String s) {
        StringBuffer res = new StringBuffer();
        char[] arr = s.toCharArray();
        for (int i = 0; i < arr.length; i++) {
            char c = arr[i];
            if (c >= '0' && c <= '9') {
                if (c == '9') res.append(0);
                else res.append(c - '0' + 1);
            } else if (c >= 'a' && c <= 'z') {
                if (c == 'z') res.append('A');
                else res.append((char) (c - 'a' + 'B'));
            } else {
                if (c == 'Z') res.append('a');
                else res.append((char) (c - 'A' + 'b'));
            }
        }
        return res.toString();
    }
    //解密
    public static String decrypt(String s) {
        StringBuffer res = new StringBuffer();
        char[] arr = s.toCharArray();
        for (int i = 0; i < arr.length; i++) {
            char c = arr[i];
            if (c >= '0' && c <= '9') {
                if (c == '0') res.append(9);
                else res.append(c - '0' - 1);
            }else if (c >= 'a' && c <= 'z') {
                if (c == 'a') res.append("Z");
                else res.append((char) (c - 'a' + 'A' - 1));
            }else {
                if (c == 'A') res.append('z');
                else res.append((char) (c - 'A' + 'a' - 1));
            }
        }
        return res.toString();
    }
}