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Util classes Random and Math have been included to provide a pseudo-random number generator and methods such as min, max and abs, respectively • exception classes – as the CLDC classes are compatible with J2SE libraries, CLDC classes throw the same exceptions as J2SE classes; there is, therefore, a fairly comprehensive list of exception classes (see Appendix 1) • error classes – in contrast to the exception classes, the error handling capabilities of CLDC are limited to the three error classes seen previously • internationalization – CLDC provides support for the translation of Unicode characters to and from byte streams; just as J2SE uses readers and writers, J2ME uses the following constructors: new new new new InputStreamReader(InputStream is); InputStreamReader(InputStream is, String name); OutputStreamReader(OutputStream os); OutputStreamReader(OutputStream os, String name); The constructors that define a string parameter can name the encoding scheme.

Once the AMS has decided that the MIDlet is ready, it makes a call to the startApp() method. It should be remembered 32 GETTING STARTED that the startApp() method can be called many times during the lifecycle of a MIDlet, so the developer should be aware of what display is made current and at what time. 0, it was advised that the Displayable object was not truly visible until startApp() had returned. 0. setCurrent(Displayable) method can, therefore, be carried out at MIDlet initialization and put in the MIDlet constructor.

1 Introduction to MIDP In the previous chapter we examined the core MIDP functionality and outlined the CLDC and MIDP classes that form the development environment. Before we start writing our first piece of code, we need to look at the basic concepts of MIDP, the most commonly used packages and methods, and how it all fits together. We’ll also look at the various development options, what they can do, and how they are installed. MIDP allows the execution of multiple MIDP applications, known as MIDlets.

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