By Qusay Mahmoud

Studying instant Java is for Java builders who are looking to quick arise to hurry and create purposes for the Micro variation viewers utilizing the hooked up, restricted gadget Configuration and the cellular info machine Profile (MIDP). The CLDC comprises APIs for small units which are limited by way of either reminiscence and processing energy. MIDP builds at the CLDC and includes APIs particularly for units corresponding to cell phones and pagers, permitting programmers to create MIDlet functions. This ebook bargains an effective advent to J2ME and MIDP, together with the javax.microedition periods, in addition to sessions surrounding the beneficial properties of a few of the systems that the J2ME helps (e.g., networking with mobile phones, greater reveal sizes and hues with PDAs, etc.)

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Later chapters show how to program with the CLDC/MIDP APIs, including GUI, event handling, networking, and databases. 5 or higher. Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 33 Chapter 4. Working with MIDlets MIDlets are very simple to implement. MIDlet abstract class and implement certain methods in that class. The MIDlet abstract class provides the basic functionality required in all MIDlets. A MIDlet runs in a controlled environment and therefore must implement certain methods that allow the application manager (which installs and runs the MIDlet) to control the behavior of the MIDlet.

Attribute name MicroEditionConfiguration MicroEditionProfile MIDlet-n MIDlet-DataSize MIDletDescription MIDlet-Icon Table 3-6. JAR manifest attributes Required Description The name and version of the J2ME configuration required. 0"). The name and version of the J2ME profile required. 0"). The name, icon, and class, separated by commas, of the nth Yes MIDlet in the MIDlet suite. The minimum number of bytes of persistent storage that the No MIDlet requires. The default is zero. No A description of the MIDlet suite.

Rms package provides four interfaces, one class, and five exceptions (see Table 3-4) for performing persistent data storage on MIDP devices. The four interfaces allow you to create implementing classes that customize how the record store compares, enumerates through, filters, and handles events that occur with data records. These classes are discussed in detail in Chapter 8. Table 3-4. util packages of the CLDC. 3. TimerTask (class) As you can see, there aren't many classes in the MIDP. However, that's not unexpected, given that we need to fit MIDP programs in such a limited space.

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