Instance methods readCollection Answers an ordered collection of sockets that are ready for reading. The select call populates an ordered collection of sockets that are ready for reading. This ordered collection is accessed through readCollection. writeCollection Answers an ordered collection of sockets that are ready for writing. The select call populates an ordered collection of sockets that are ready for writing. This ordered collection is accessed through writeCollection. exceptionCollection Answers an ordered collection of sockets that have some exception condition. The select call populates an ordered collection of sockets that have some exception condition. This ordered collection is accessed through exceptionCollection