Dinesh on Java

Categories: JSTL

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.

Syntax:
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" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL Join Function Example</title>
</head>
<body>
  <c:set var="array1" value="${fn:split('I am a good programmer in java', ' ')}">
  <c:out value="${fn:join(array1, '-')}"></c:out>
</body>
</html>

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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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!