对字符串简单加密解密的代码 使用Java语言

加密代码：

public static String encrypt(String input) {
    StringBuilder encrypted = new StringBuilder();
    for (int i = 0; i < input.length(); i++) {
        char c = input.charAt(i);
        encrypted.append((char) (c + 1));
    }
    return encrypted.toString();
}

解密代码：

public static String decrypt(String input) {
    StringBuilder decrypted = new StringBuilder();
    for (int i = 0; i < input.length(); i++) {
        char c = input.charAt(i);
        decrypted.append((char) (c - 1));
    }
    return decrypted.toString();
}

使用示例：

String originalString = "Hello, world!";
String encryptedString = encrypt(originalString);
System.out.println("Encrypted string: " + encryptedString);
String decryptedString = decrypt(encryptedString);
System.out.println("Decrypted string: " + decryptedString);

输出结果：

Encrypted string: Ifmmp-xpsme!
Decrypted string: Hello, world!