题解 | #字符串加解密#

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 scanner = new Scanner(System.in);
        String string = scanner.nextLine();
        String passWord = scanner.nextLine();
        StringBuilder res1 = new StringBuilder();
        StringBuilder res2 = new StringBuilder();

        for (char c : string.toCharArray()) {
            if (Character.isLetter(c)){
                // 字母加密
                if (c == 'z'){
                    res1.append('A');
                    continue;
                }
                if (c == 'Z'){
                    res1.append('a');
                    continue;
                }
                if (Character.isLowerCase(c)){
                    int i = c + 1;
                    char cc = (char) i;
                    res1.append(Character.toUpperCase(cc));
                } else {
                    int i = c + 1;
                    char cc = (char) i;
                    res1.append(Character.toLowerCase(cc));
                }
            } else {
                // 数字加密
                int num = c - '0';
                if (num == 9){
                    res1.append(0);
                } else {
                    res1.append(num + 1);
                }
            }
        }
        for (char c : passWord.toCharArray()) {
            if (Character.isLetter(c)){
                // 字母解密
                if (c == 'A'){
                    res2.append('z');
                    continue;
                }
                if (c == 'a'){
                    res2.append('Z');
                    continue;
                }
                if (Character.isLowerCase(c)){
                    int i = c - 1;
                    char cc = (char) i;
                    res2.append(Character.toUpperCase(cc));
                } else {
                    int i = c - 1;
                    char cc = (char) i;
                    res2.append(Character.toLowerCase(cc));
                }
            } else {
                // 数字解密
                int num = c - '0';
                if (num == 0){
                    res2.append(9);
                    
                } else {
                    res2.append(num - 1);
                }
            }
        }
        System.out.println(res1);
        System.out.println(res2);
    }
}