the below code is from codejava.com website. But I can't understand how this code work because I am just start learning jstl in java. I don't know how this condition work <c:if test="${param.movieCheck == 'yes'}"> . i don't understand how param.movieCheck fetch radio button value. Can we fetch any component value using param.attributename ?ex. param.movieCheck value
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title><c:if> Demo</title>
</head>
<body>
<h1><c:if> Demo</h1>
<c:if test="${param.movieCheck == 'yes'}">
Ok! Great Choice!
</c:if>
<c:if test="${param.movieCheck == 'no'}">
Oops! Perhaps you can try watching them!
</c:if>
<br/>
<br/>
<form name="ifForm"
action="${pageContext.request.contextPath}/tag-types/core/if.jsp"
method="POST">
Do you like movies? <br/>
Yes <input type="radio" name="movieCheck" value="yes"/><br/>
No <input type="radio" name="movieCheck" value="no"/><br/>
<input type="submit" value="submit"/>
</form>
</body>
</html>
Output : 
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