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Download e-book for iPad: Beginning J2ME: From Novice to Professional by Sing Li

By Sing Li

ISBN-10: 1590594797

ISBN-13: 9781590594797

J2ME is a platform for instant and cellular Java software improvement. starting J2ME makes this and all of the enjoyable you could have with it obtainable to the 1st time instant Java developer in addition to precious to the skilled. This publication comprises insurance reminiscent of sound HTTPS help, plenty of person interface API improvements, a online 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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Example text

Jargoneer’s TextBox TextBox is a text input field. It has a title and an area for entering text. It has a simple design and can easily be shown on screens of different sizes. Even more interesting are the commands that appear at the bottom of the TextBox. These are Exit and Find. SCREEN, 0); // ... setCommandListener(this); Notice how the commands are created. You specify only a label and a type, and you register an event listener to find out when the commands are invoked. This is purposely vague—it leaves the implementation considerable latitude in deciding how commands should be displayed and invoked.

An application written using the MIDP APIs will be directly portable to any MIDP device. If you’ve been following Java’s development for any time, this should sound familiar. It’s the same “Write Once, Run Anywhere” (WORA) mantra that Sun’s been repeating since 1995. 1 (particularly the browser implementations). While Java’s cross-platform capabilities in Java 2 are generally successful, WORA still has the taint of an unfulfilled promise. Does MIDP deliver painless cross-platform functionality?

Packaging a MIDlet suite consists of three steps: 1. The class files and resource files that make up the MIDlets are packaged into a JAR file. Usually, you’ll use the jar command-line tool to accomplish this. 2. Additional information that’s needed at runtime is placed in the JAR’s manifest file. All JARs include a manifest; a MIDlet suite JAR contains some extra information needed by application management software. 3. An application descriptor file should also be generated. jad extension that describes the MIDlet suite JAR.

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Beginning J2ME: From Novice to Professional by Sing Li


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