JSTL fn:join() Function

JSTL Join function is used to concatenate the strings contained in an array with the specified string.

"fn:join" is a string function of JSP Standard Tag Library(JSTL). This function is used to return string with all the elements of an array separated by a "separator".

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)

JST Join Function Example-

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL Join Function Example</title>
  <c:set var="array1" value="${fn:split('I am a good programmer in java', ' ')}">
  <c:out value="${fn:join(array1, '-')}"></c:out>

Output: I-am-a-good-programmer-in-java

As you can see above, fn:join() takes an array of String as input parameters and returns the result of concatenation of strings with another string specified as 2nd parameter in JSTL join function.

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