The JSTL function fn:length() is used for computing the length of a string or to find out the number of elements in a collection.
Syntax
int length(Object)
Return type of this function is int. It returns the length of the object provided in it as an argument.
Example of fn:length()
Here we are computing the length of the three different strings using the function.
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<title>JSTL fn:length() example</title>
</head>
<body>
<c:set var="string1" value="This is String1"/>
<c:set var="string2" value="Hi"/>
<c:set var="string3" value="string3"/>
Length of String1 is: ${fn:length(string1)}<br>
Length of String2 is: ${fn:length(string2)}<br>
Length of String3 is: ${fn:length(string3)}
</body>
</html>
Output:
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