Beginning J2ME: From Novice to Professional by Sing Li

By Sing Li

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

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The J2ME Wireless Toolkit takes care of the details as long as you put the source code in the right directory. 1. Start the toolkit, called KToolbar. 2. Choose New Project from the toolbar to create a new project. 15 16 CHAPTER 2 ■ BUILDING MIDLETS 3. When the J2ME Wireless Toolkit asks you for the name of the project and the MIDlet class name, use “Jargoneer” for both. 4. Click the Create Project button, and then the OK button to dismiss the project settings window. Figure 2-1 shows the New Project dialog box.

In this case, this option should be used to specify the classes directory in the MIDP reference implementation installation. java You will need to adjust the path to classes if you installed the MIDP reference implementation in a different location. Preverifying Class Files Now comes an entirely new step in building your program, preverifying. Because the memory on small devices is so scarce, MIDP (actually, CLDC) specifies that bytecode verification be split into two pieces. Somewhere off the device, a preverify step is performed.

At runtime, any MIDlet that tries to make an HTTP connection will be granted the permission. Attempts to make other connection types will be denied. The simple IP-origin criterion for SimplePD is pretty weak. MIDlet suites in SimplePD are susceptible to many attacks, including data modification, data replacement, man-in-the-middle attacks, and DNS spoofing. More robust rules are based on cryptographic solutions for data integrity and authentication. 509 PKI” describes one such scheme, including additional manifest attributes.

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