1) The final keyword on a method means that the method cannot be overridden in a subclass. But since the main() method is a static method, it can't be overridden anyway. So making the main() method final makes no sense.

2) main method can be final.

3) A class without a main method can be run by JVM, if its ancestor class has a main method....

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1<jsp:getProperty name="test" property="date"/> will print the value of property.

2<jsp:useBean id="test" class="com.Example">
<jsp:setProperty name="test" property="*"/>
</jsp:useBean>

3 <jsp:setProperty name="test" property="date"...

The message when refreshing a page is displayed when session is being used by the JSP/Servlet.

In Servlet, session is got by:

HttpSession session = request.getSession(true);

In JSP the way is:

<% page session="true"%>

request--
1 getParameter
2 cookies
3 request method (GET/POST)
4 getSession

response--
1 setParameter
2 getWriter
3 setContentType
4 addCookie

out in JSP refers to buffered version of PrintWriter which is known as JSPWriter
session has getAttribute("name") and setAttribute("name","value")

<% String url = response.encodeURL("Myjsp.jsp"); %>

<form method="post" action=<% url %>?param=value")
</form>

The prototype pattern is used in cases where the cost of creating a new object is much more than simply editing the attributes of an already existing object. So this pattern should be used when one has the privileges to modify the desired attributes of the object.
In java, the prototype of an object can be got by using the clone method. The method...

The Singleton pattern is used for classes which should have only one instance in the application. The other classes can't invoke the constructor directly because it is declared private and some public static method is provided which returns the single instance. This pattern makes the instance available globaly and thus should be used...