<h:commandLink value="next" action="#{student.getNext()}"  rendered="#{! (student.maximumSize<=student.idvalue.size)}" ></h:commandLink>

<h:commandLink rendered="#{student.maximumSize gt student.idvalue.size}" value="next" action="#{student.getNext()}"></h:commandLink>

<h:commandLink rendered="#{not (student.maximumSize le student.idvalue.size)}" value="next" action="#{student.getNext()}"></h:commandLink>

==  -->  eq
!=  -->  ne
<   -->  lt
>   -->  gt
<=  -->  le
>=  -->  ge