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Java 2 Platform, Micro Edition (J2ME) is the old name for the Java ME platform, because Sun Microsystems took off the 2 from the name after publish new versions of the platforms (like Java 5 or Java 6).
Here's the somewhat bizarre history of Sun's Java technology version numbering:
|old name, or "developer version"||new name, or "product version"|
|Java2 1.5||Java 5|
|Java2 1.6||Java 6|
|("Java2" phased out)||Java 7|