計算機(jī)相關(guān)專業(yè)畢業(yè)設(shè)計外文翻譯--移動設(shè)備的應(yīng)用平臺—j2me簡介(編輯修改稿)
2025-06-25 17:11 本頁面
【文章內(nèi)容簡介】 memory, and other norms Size, as well as set A set of these devices on the implementation of the Java program can be used by the type of library, these norms are defined by the type of library for the Java standard library39。s core categories and subtype device features the line The expansion of the library category. For example, on CLDC specifications, can support the core category for the library .*, . *, .*, and support the expansion of the category for the library . *. A distinction between the two main Configuration after, J2ME and then in the definition of the concept of a Profile. Profile is a framework in the Configuration on the specifications. The reason why there is the concept of the Profile in order to more clearly separate the various areas of embedded Java devices, as well as how to develop the procedures they should have the function of what. Therefore Profile of the definition of embedded devices are very specific and related to the expansion of the types of libraries, and the Java program embedded in a variety of devices on a user interface that shows how the definition of the Profile is inside. Profile of the expansion of the definition of the type of library is based on the underlying Configuration within the definition of the core categories established by the library. 2. What39。s New in the J2ME Wireless Toolkit The awardwinning J2ME Wireless Toolkit has bee the de facto standard toolkit for developing applications for Java 2, Micro Edition (J2ME). Since its debut in 2020, the toolkit has evolved to keep pace with the rapidly changing face of mobile Java technology. Don39。t be misled by the small change in version number from . The new toolkit supports new optional APIs specified through the Java Community Process (JCP) in four vital areas: 3D graphics, multimedia messaging, Bluetooth working,and data this article I39。ll describe these new APIs and show you how they39。re implemented in the toolkit. Before I do, take a moment to admire the updated DefaultColorPhone emulator skin. Since version , this skin has gotten a larger screen (320 x 240, or QVGA) and far more colors (4096 instead of 256). Mobile 3D Graphics: JSR 184, the Mobile 3D Graphics API for J2ME (M3G), provides threedimensional graphics functionality in a pact package that39。s appropriate for devices that support the most widely adopted J2ME software stack, the Connected, Limited Device Configuration (CLDC) and the Mobile Information Device Profile (MIDP). The API provides two APIs for displaying 3D content. The immediate mode API makes it possible for applications to create and manipulate 3D elements directly. On top of this layer is a scene graph API, also called retained mode, that makes it possible to load and display entire 3D scenes you39。ve designed ahead of time. Applications may use whichever API is most appropriate, or a bination of retained mode and immediate mode. The JSR 184 specification also defines a file format for scene graphs, .m3g. The toolkit39。s emulator fully supports JSR 184 and you39。ll find several MIDlets that show off the API39。s capabilities in the Demo3D project. Life3D demonstrates the use of immediate mode: PogoRoo is an interactive demonstration that features a bouncing kangaroo:Finally, retainedmode shows how to load and render a scene graph file: Multimedia Messaging: The J2ME Wireless Toolkit has long supported JSR 120, version of the Wireless Messaging API (WMA)。 the new release supports WMA (JSR 205), which expands WMA39。s capabilities to include Multimedia Messaging. In the toolkit, messaging takes place in a simulated environment. If you run the emulator multiple times, applications on the emulators can municate with each other, and you can use the toolkit39。s handy WMA Conso
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