This tutorial handles the life cycle and user interface of Mobile Information Device Profile (MIDP) applications. First, the general design of MIDP applications will be discussed. Then, the high-level user interface API will be explained. Finally, the low-level user interface API for free graphics and games will be described. All applications for the MID Profile must be derived from a special class, MIDlet. The MIDlet class manages the life cycle of the application. It is located in the package javax. microedition.midlet.

If your company already relies on multitiered enterprise Java applications, then you may be closer to a wireless future than you think. By outlining a sample application, Aashish Patil shows you how to connect your existing enterprise Java infrastructure to a wireless netowrk with minimal investment in equipment and labor. Using existing EJBs, modified servlets, and new WML and WMLScript pages makes the process a snap. The Wireless Application Protocol (WAP) can add value to the existing Web architecture of an enterprise. If you are already using enterprise Java applications, you can easily integrate them with WAP services to bring useful data and functionality to a mobile workforce. In this article, I will cover the basics of using J2EE with WAP and then build a sample WAP/enterprise Java application that demonstrates how you can connect your own EJBs to a wireless network.