When creating applications for mobile environment, you naturally need to take into account the different mobile device manufacturers' platforms. MTJ allows you to target specific platforms or even specific mobile devices inside a mobile device platform. Also, you can test the application with the available emulators, and then deploy the application into the target device.
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Mobile Tools for the Java Platform
Java ME platform
Mobile SDKs
Mobile runtimes
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Managing mobile SDKs
Creating your first MIDlet
Managing applications
Managing security
Deploying applications to mobile devices