题解 | #字符串加解密#

import java.util.Scanner;
import java.lang.StringBuilder;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String a = in.nextLine();
            String b = in.nextLine();
            showCodeResult(a, b);
        }
    }
    private static void showCodeResult(String a, String b) {
        char[] arr1 = a.toCharArray();
        char[] arr2 = b.toCharArray();
        StringBuilder sb1 = new StringBuilder();
        StringBuilder sb2 = new StringBuilder();
        for (int i = 0; i < arr1.length; i++) {
            if (Character.isUpperCase(arr1[i])) {
                if (arr1[i] == 'Z') {
                    sb1.append('a');
                } else {
                    sb1.append((char)(arr1[i] + 1 + 32));
                }
            } else if (Character.isLowerCase(arr1[i])) {
                if (arr1[i] == 'z') {
                    sb1.append('A');
                } else {
                    sb1.append((char)(arr1[i] + 1 - 32));
                }
            } else {
                if (arr1[i] == '9') {
                    sb1.append('0');
                } else {
                    sb1.append(arr1[i] - '0' + 1);
                }
            }
        }
        System.out.println(sb1.toString());
        for (int i = 0; i < arr2.length; i++) {
            if (Character.isUpperCase(arr2[i])) {
                if (arr2[i] == 'A') {
                    sb2.append('z');
                } else {
                    sb2.append((char)(arr2[i] - 1 + 32));
                }
            } else if (Character.isLowerCase(arr2[i])) {
                if (arr2[i] == 'a') {
                    sb2.append('Z');
                } else {
                    sb2.append((char)(arr2[i] - 1 - 32));
                }
            } else {
                if (arr2[i] == '0') {
                    sb2.append('9');
                } else {
                    sb2.append(arr2[i] - '0' - 1);
                }
            }
        }
        System.out.println(sb2.toString());
    }
}