JSTL fn:join() Function


The fn:join() function concatenates all the elements of an array into a string with a specified separator.


The fn:join() function has following syntax:

String join (java.lang.String[], java.lang.String)


Following is the example to explain the functionality of this function:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<title>Using JSTL Functions</title>

<c:set var="string1" value="This is first String."/>
<c:set var="string2" value="${fn:split(string1, ' ')}" />
<c:set var="string3" value="${fn:join(string2, '-')}" />

<p>Final String : ${string3}</p>


Note: fn:split() function returns an array splitting into diffrenet elements.

This would produce following result:

Final String : This-is-first-String.