Part 4: Observer Pattern(JAVA)

Create a news app that uses the observer pattern to send out a news text update to each client that it serves.

3 pts. Create all the needed interfaces and implement all the required methods to get this to work (register, update, display, etc) in concrete classes.

3 pts. Your main app (a class called NewsApp) will create the observer and send three separate updates to its clients. Create at least 3 clients.

1pt. Make your Subject a singleton.