How can I implement encryption in Java?

How can I implement encryption in Java?

You can use the Java Cryptography Architecture (JCA) to implement encryption. Would you like an example?

Yes, please provide a simple example of AES encryption.

Here's a basic example using AES:

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

public class AESCrypto {
    public static void main(String[] args) throws Exception {
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128);
        SecretKey secretKey = keyGen.generateKey();

        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encrypted = cipher.doFinal("Hello World".getBytes());
        System.out.println("Encrypted: " + new String(encrypted));
    }
}

What about decryption? How do I decrypt the data?

To decrypt, you need to initialize the cipher in DECRYPT_MODE with the same key. Here's how:

cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] decrypted = cipher.doFinal(encrypted);
System.out.println("Decrypted: " + new String(decrypted));