Final Class

Scenario: You are designing a secure system where certain components (e.g., the encryption algorithm) must not be altered or extended.

Task:

1. Create a final class EncryptionAlgorithm.
2. Attempt to create a subclass CustomEncryptionAlgorithm that extends EncryptionAlgorithm and observe the error.
3. Instantiate the EncryptionAlgorithm class and call a method to demonstrate its functionality.