题解 | #字符串加解密#

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    while (sc.hasNext()) {
        String cryptStr = sc.nextLine();
        String decryptStr = sc.nextLine();
        
        StringBuilder cryptBuilder = new StringBuilder();
        char[] cryptChars = cryptStr.toCharArray();
        for (char cryptChar : cryptChars) {
            if (Character.isLetter(cryptChar)) {
                if (cryptChar >= 'a' && cryptChar <= 'z') {
                    if (cryptChar == 'z') {
                        cryptBuilder.append('A');
                    } else {
                        cryptBuilder.append(Character.toUpperCase(((char)(cryptChar + 1))));
                    }
                } else {
                    if (cryptChar == 'Z') {
                        cryptBuilder.append('a');
                    } else {
                        cryptBuilder.append(Character.toLowerCase(((char)(cryptChar + 1))));
                    }
                }
            } else {
                if (cryptChar >= '0' && cryptChar <= '9') {
                    if (cryptChar == '9') {
                        cryptBuilder.append('0');
                    } else {
                        cryptBuilder.append((char)(cryptChar + 1));
                    }
                } else {
                    cryptBuilder.append(cryptStr);
                }
                
            }
        }
        System.out.println(cryptBuilder.toString());
        
        StringBuilder decryptStrBuilder = new StringBuilder();
        char[] decryptChars = decryptStr.toCharArray();
        for (char decryptChar : decryptChars) {
            if (Character.isLetter(decryptChar)) {
                if (decryptChar >= 'a' && decryptChar <= 'z') {
                    if (decryptChar == 'a') {
                        decryptStrBuilder.append('Z');
                    } else {
                        decryptStrBuilder.append(Character.toUpperCase(((char)(decryptChar - 1))));
                    }
                } else {
                    if (decryptChar == 'A') {
                        decryptStrBuilder.append('z');
                    } else {
                        decryptStrBuilder.append(Character.toLowerCase(((char)(decryptChar - 1))));
                    }
                }
            } else {
                if (decryptChar >= '0' && decryptChar <= '9') {
                    if (decryptChar == '0') {
                        decryptStrBuilder.append('9');
                    } else {
                        decryptStrBuilder.append((char)(decryptChar - 1));
                    }
                } else {
                    decryptStrBuilder.append(decryptChar);
                }
            }
        }
        System.out.println(decryptStrBuilder.toString());
    }
}

}