IF and choose

if: only judgment without else

<!-- set object -->
<c:set var="pname" value="renliang"></c:set>

<!-- output object -->
<c:out value="${pname }"></c:out>

<!-- Judgment object -->
<hr>
<c:if test="${ not empty pname }">
	<c:out value="not  null"></c:out>
</c:if>

Usage of choose:

<c:set var="score" value="150"></c:set>

<c:choose>
	<c:when test="${score < 60 }">
		<c:out value="${'Failed' }"></c:out>
	</c:when>
	
	<c:when test="${score > 60 && score < 100 }">
		<c:out value="${'Pass' }"></c:out>
	</c:when>
	<c:when test="${score >100 }">
		<c:out value="${'social' }"></c:out>
	</c:when>
	
	
</c:choose>