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MIDP 2.0 (JSR 118) is a revised version of the MIDP 1.0 specification. New features include an enhanced user interface, multimedia and game functionality, more extensive connectivity, over-the-air provisioning (OTA), and end-to-end security. MIDP 2.0 is backward-compatible with MIDP 1.0, and continues to target mobile information devices like mobile phones and PDAs. More detailed information on these features can be found in What's New in MIDP 2.0.
MIDP 1.0 (JSR 37) is the original specification, which provides core application functionality required by mobile applications, including basic user interface and network security.
MIDP RI 2.0 is based on the MIDP 2.0 specification and CLDC RI 1.0.4. The MIDP RI has been created for device manufacturers who want to port this J2ME profile to another platform.
MIDP RI 1.0.3 is based on the MIDP 1.0 specification and CLDC RI 1.0.3. Its target audience is manufacturers who want to implement MIDP 1.0 on their devices.
The Sun Java Wireless Toolkit provides complete development support for developing MIDP applications, and works in combination with today's leading IDEs.
Sun ONE Studio, Mobile Edition is a Java-technology IDE for developing applications that can be deployed to Java technology-enabled mobile devices.