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);
        String toEncrypt = scan.nextLine();
        String toDeciphering = scan.nextLine();
        char[] chrs1 = toEncrypt.toCharArray();
        char[] chrs2 = toDeciphering.toCharArray();
        StringBuffer sb1 = new StringBuffer("");
        StringBuffer sb2 = new StringBuffer("");
        for (char chr : chrs1) {
            if (chr >= 'a' && chr <= 'z') {
                if (chr == 'z') {
                    sb1.append('A');
                } else {
                    sb1.append(String.valueOf((char) (chr + 1)).toUpperCase());
                }
            } else if (chr >= 'A' && chr <= 'Z') {
                if (chr == 'Z') {
                    sb1.append('a');
                } else {
                    sb1.append(String.valueOf((char) (chr + 1)).toLowerCase());
                }
            } else {
                if (chr == '9') {
                    sb1.append('0');
                } else {
                    sb1.append((char) (chr + 1));
                }
            }
        }
        for (char chr : chrs2) {
            if (chr >= 'A' && chr <= 'Z') {
                if (chr == 'A') {
                    sb2.append('z');
                } else {
                    sb2.append(String.valueOf((char) (chr - 1)).toLowerCase());
                }
            } else if (chr >= 'a' && chr <= 'z') {
                if (chr == 'a') {
                    sb2.append('Z');
                } else {
                    sb2.append(String.valueOf((char) (chr - 1)).toUpperCase());
                }
            } else {
                if (chr == '0') {
                    sb2.append('9');
                } else {
                    sb2.append((char) (chr - 1));
                }
            }
        }
        System.out.println(sb1);
        System.out.println(sb2);
    }
}