The getEnumeration method returns a java.util.Enumeration that is used to scan the queue's messages. It may be an enumeration of the entire content of a queue, or it may contain only the messages matching a message selector.

Messages may be arriving and expiring while the scan is done. The JMS API does not require the content of an enumeration to be a static snapshot of queue content. Whether these changes are visible or not depends on the JMS provider.

A QueueBrowser can be created from either a Session or a QueueSession.

Also see:

javax.jms.Session#createBrowser
javax.jms.QueueSession#createBrowser
javax.jms.QueueReceiver

 public  void close() throws JMSException
Closes the QueueBrowser.

Since a provider may allocate some resources on behalf of a 
QueueBrowser outside the Java virtual machine, clients should close them
when they 
are not needed. Relying on garbage collection to eventually reclaim 
these resources may not be timely enough.

 public Enumeration getEnumeration() throws JMSException
Gets an enumeration for browsing the current queue messages in the
order they would be received.

 public String getMessageSelector() throws JMSException
Gets this queue browser's message selector expression.

 public Queue getQueue() throws JMSException
Gets the queue associated with this queue browser.