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Download Core J2ME Technology by John W. Muchow PDF

By John W. Muchow

With Nokia on my own saying deployment of a hundred and fifty million telephones operating Sun's J2ME and cellular info machine Profile (MIDP), developer curiosity in those applied sciences is gigantic. Now, there is an authoritative, example-rich technical source that might permit each Java developer to construct powerful purposes for any J2ME cellular equipment -- speedy. Written by way of one of many world's so much skilled Java builders and running shoes, this hands-on ebook teaches J2ME and MIDP utilizing greater than 50 well-designed examples -- them all sincerely commented, completely defined, and on hand for obtain on the internet. center J2ME know-how covers every thing a developer must get effects. John Muchow starts with an summary of the J2ME, together with configurations and profiles; then walks you thru developing the whole J2ME improvement setting -- from downloading J2ME to troubleshooting. The e-book then offers exhaustive insurance of the MIDP programming interface: the fundamentals of the MIDlet software lifecycle; occasion dealing with; low-level elements; power garage; networking (including verbal exchange with servlets and consultation management); and extra. The publication additionally comprises complete references to either key parts of J2ME: MIDP and the hooked up constrained equipment Configuration (CLDC) specification. For all skilled Java builders who are looking to create cellular functions with J2ME.

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For example, if the value of the attribute MIDlet-Jar-Size specifies a JAR that is too large for the device, the application manager can gracefully refuse to load the MIDlet suite. This would obviously be preferred over simply trying to load each and every MIDlet until a failure occurs. Project Management Using Java Packages A Java package is a collection of classes and interfaces. Packages are helpful when your code grows beyond a few simple files. lcdui, which provides user interface components such as forms and textboxes.

We'll wrap up this chapter with the J2ME Wireless Toolkit—a free software tool provided by Sun to simplify the J2ME development cycle. This tools offers a basic GUI for project management, previewing and packaging of J2ME programs. Download the Software Before going any further, we need to download the software. There are three required software packages. 1. 3 2. com/products/cldc 3. com/products/midp/ Operating System and Software Version Numbers I will be using Microsoft Windows as the operating system as I describe how to install and configure J2ME.

The GCF was designed to support many devices and protocols, both current and those yet to be developed. The first concept to understand is that the GCF does not include implementations for any protocols, it simply lays the groundwork. The actual classes providing the implementation(s) are done at the Profile level. For example, any device manufacturer providing support for the MIDP is required to implement the HTTP protocol (using the class HttpConnection). GCF provides one class, Connector, to open any type of connection.

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