<c:if test="${foo == 'bar'}">...</c:if>

<c:choose>
   <c:when test="${foo == 'bar'}">...</c:when>
   <c:when test="${foo == 'baz'}">...</c:when>
   <c:otherwise>...</c:otherwise>
</c:choose>

if (some_condition) {
    // ...
}

if (some_condition) {
    // ...
} else if (some_other_condition) {
    // ...
} else {
    // ...
}