fn:length() JSTL Function
fn:length() JSTL Function Example explains about How To Use fn:length() JSTL Function
You can use fn:length() in two ways
1) You can find the length of a string 2) You can find the size of an array or collections
fn:length() JSTL Function is used to find the length of a String, Collection or an array of objects(Object[]).
Example pattern : ${fn:length(someCollection)}
int length(java.lang.Object)
You can see the below example, which is demonstrating fn:length() JSTL Function
Required Libraries
fn:length() Example
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%> <%@ page import="java.util.ArrayList"%> <% ArrayList<String> numList = new ArrayList<String>(); numList.add("one"); numList.add("two"); numList.add("three"); request.setAttribute("numList", numList); %> <html> <body> The length of the numList: ${fn:length(numList)}<br/> The length of the test String: ${fn:length('hello')} </body> </html>
Output
The length of the numList: 3The length of the test String: 5