Struts 2 is a Framework which is an implementation of MVC-2 at server side. Struts 2 have many advantages over the standard servlet and JSP API alone. But struts 2 is complex so Struts2 have many disadvantages too.
Frequently, there arises need to select items in our ListView. As the row of the ListView are getting recycled you cannot store the selection on the View level. To persist the selection in ListView we must define our own Adapter class. In this adapter class we attach a listener to the view which is responsible for selecting the model element.
This is to start iOS developement from scratch. This step by step process will let you know to create a simple iPhone program with a label, view and a button.
The listener is a separate process that runs on the database server computer. It receives incoming client connection requests and manages the traffic of these requests to the database server. Starting up and shutting down the oracle listener is a routine task for a database administrator.
Java NIO is alternative for standard IO API for input ouput operation. NIO allows you to manage multiple channels (network connections or files) using only a single (or few) threads, but the cost is that parsing the data might be somewhat more complicated than when reading data from a blocking stream.