can we change the topic name to something else other than chatter when publishing and subscribing messages?

edit

I created a publisher in python and a listener in rosjava. I sent hello world under topic "chatter" from talker.py to listener.java. But when I changed the topic from "chatter" to "uic", the publisher publishes the message but the listener doesnot receive anything. I can see the following in my terminal and see that the listener is still subscribing to the chatter topic even after i changed it in listener.java code.

INFO: Response<success, subscribed="" to="" [="" chatter],="" []&gt;="" jan="" 17,="" 2014="" 11:55:35="" am="" org.ros.internal.node.topic.defaultsubscriber$1="" onmasterregistrationsuccess="" info:="" subscriber="" registered:="" subscriber<topic<topicidentifier<="" chatter="">, TopicDescription<std_msgs string,="" 992ce8a1687cec8c8bd883ec73ca41d1="">>>

Why is my listener still subscribing to topic chatter even after i changed it in the code?

I edited this line in the code where I changed chatter to uic:

Subscriber<std_msgs.string> subscriber =
connectedNode.newSubscriber("uic", std_msgs.String._TYPE);