Wireless Java

Using the Standalone CLDC and KVM

If you want to experiment with the raw KVM and CLDC classes, you can download the standalone CLDC and KVM. As of this writing, the latest edition of the CLDC itself is version 1.0.2. The CLDC 1.0.2 contains an updated version of the KVM. The KVM code has been rewritten to improve performance and includes a faster bytecode interpreter, better garbage collection, Java-level debugging APIs, preverifier improvements, and several bug fixes. If you wish to download the standalone CLDC and KVM, you can find it at the following address: http://java.sun.com/products/kvm.

Warning

Note that this is different than the J2ME Wireless Toolkit that we used in Chapter 1. This distribution does not contain any MIDP classes, nor does it contain a MIDP emulator. Hence, it will only execute programs that adhere to the base CLDC specification and not any MIDP functionality. If you are solely interested in writing applications for the MIDP, you can just read through this section without taking any action.

This distribution contains KVM implementations for Windows, Solaris, and Linux operating systems, as well as the CLDC classes that can be used to compile and run applications. After downloading and uncompressing the distribution, you should have a series of directories, as shown in Table 2-4.

Table 2-4. CLDC/KVM directories

Directory	Description
api	The Java classes and source code for the CLDC
bin	Binaries for each of the target platforms
build	Utility ...