Beginning J2ME: From Novice to Professional, 3rd edition by Jonathan Knudsen Sing Li

By Jonathan Knudsen 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 beneficial to the skilled. This booklet comprises assurance equivalent to sound HTTPS aid, plenty of consumer interface API improvements, a video game API, sound/music API, 3D pix, Bluetooth, and lots more and plenty extra. It’s effortless to learn with plenty of sensible hands-on and ready to use code examples.

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Additional resources for Beginning J2ME: From Novice to Professional, 3rd edition (April 25, 2005)

Example text

However, it lives outside the JAR and enables application management software to learn about a MIDlet JAR without installing it. jad extension. 0 If your MIDlet suite JAR is a different size, enter the actual size for the MIDlet-Jar-Size entry. The MIDlet descriptor is automatically generated when you click the Build button in the J2ME Wireless Toolkit. If you’re using the J2ME Wireless Toolkit, you won’t need to create the application descriptor yourself. Using an Obfuscator Because MIDP devices have so little memory, MIDlet suites should be as compact as possible.

Certain checks are performed, and the class file is massaged into a format that the lightweight second-step verifier can easily handle. This format is really just a regular class file, with some additional data attached by the preverifier. 2. On the device, the second step of verification is performed as classes are loaded. If a class file has not been preverified, it is rejected. The MIDP reference implementation and the J2ME Wireless Toolkit contain a tool called preverify that performs the first step.

Permission Types The protection domain contains the permissions that will be granted to MIDlets (allowed permissions) as well as the permissions for which the user must be consulted (user permissions). There are several varieties of user permissions. Blanket means that the user is only required to grant or deny the permission once for a MIDlet suite.

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