How to compile and run in terminal:

$ javac Project/MainProducer.java
$ java Project/MainProducer

System Setup: (Compile all then run in sequence) :

MainProducer.java

Port and Address are set so you can just run it without type in, same below

Broker.java

Enter Y for the first broker, N and {Port} for backup brokers

ServerApp5000.java

If need multiple servers, run ServerApp5001.java etc.

ClientApp6000.java

If need multiple client, run ClientApp6001.java etc.

To try on some feathers:

ClientMultipleRegister.java to register with one certain topic

DeleteClient.java to unregister with one certain topic

DeleteServer.java to delete one certain server