JSTL Function fn:join()

The <fn:join()> is a string function of JSP Standard tag Library(JSTL).This function is used for joining all the elements of an array into a string with a specified operator and returns the output. This function returns string with all the elements of an array separated by a separator.

Syntax of <fn:join()> function

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

Example of <fn:join()> function

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>

	<c:set var="str" value="mahantesh  maruti" />
	<c:set var="str1" value="${fn:split(str,' ')}" />
	<c:out value="${fn:join(str1,'-')}" />


Details of the Code

  • <c:set var=”str” value=”mahantesh maruti” /> tag is used to set the value for variable into the given scope .
  • <c:set var=”str1″ value=”${fn:split(str,’ ‘)}” /> tag uses split() function to split string into an array of substrings based on given delimiter.
  • <c:out value=”${fn:join(str1,’-‘)}” /> tag is used to join the elements of array into string separated by the separator.

Steps for Execution

  • Save this file as join_example.jsp in your eclipse IDE.
  • Now select this jsp file, right mouse click and select Run as ->Run on server


When the execution process completed successfully we will get the following output:


Previous Tutorial :  JSTL Function fn:indexOf()  :: Next Tutorial : JSTL Function fn:split()

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