By Sing Li

J2ME is a platform for instant and cellular Java program improvement. starting J2ME makes this and the entire enjoyable you could have with it obtainable to the 1st time instant Java developer in addition to necessary to the skilled. This e-book contains insurance akin to sound HTTPS aid, plenty of person interface API improvements, a video game API, sound/music API, 3D photographs, Bluetooth, and masses extra. Its effortless to learn with plenty of sensible hands-on and ready to use code examples.

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Extra resources for Beginning J2ME: From Novice to Professional

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In Chapter 10, we’ll explain the names of the network permissions in detail. For the moment, suppose that you write a MIDlet that needs to make a socket connection. socket. The MIDlet itself needs no knowledge of permissions. SecurityException. There is a method in the MIDlet class that programmers can use to check if a permission will be granted or denied: public final int checkPermission(String permission) This method returns 1 if the permission is granted and 0 if the permission is denied. A special return value, -1, indicates that the implementation cannot determine whether the permission will be granted or denied, which might be the case if the user will be asked about the given permission.

In general, you will be able to place most of the processing burden of your application on a server component, making your client MIDlet’s life very easy. • In this particular application, the HTML parsing is not very stable. Suppose the server we are using decides to return its Jargon File definitions in a different format; if four million users are running Jargoneer, then four million copies of our code have just broken. Performing this task on a server gives it a single point of failure and a single point of update.

If all goes well, you’ll see something like the window shown in Figure 2-2 in the next section. Congratulations! You’ve just built and run your first MIDlet. CHAPTER 2 ■ BUILDING MIDLETS Using the Emulator Controls The J2ME Wireless Toolkit emulator appears as a generic mobile phone, as shown in Figure 2-2. Figure 2-2. Buttons on the J2ME Wireless Toolkit emulator SUN’s J2ME Wireless Toolkit emulator exhibits several qualities that you are likely to find in real devices: • The device has a small screen size and limited input capabilities.

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