How to use any String as Secret Key for Encryption and Decryption in java, String as Secret Key at Cryptography in java

This java source code shows how to use any kind of string as secret key for encryption and decryption.

Step 1: Input any string value as secret key.

Step 2: Encrypt a message using this secret key. It provides ciphertext.

Step 3: Decrypt a ciphertext using this secret key. It provoides original message.