first off you question sounds like "how do I do first class functions in java" historically that answer was "make a class with one method, it's shit suck it" things are better now though. But really ...

Mobile technology continues to grow in popularity. And Java Micro Edition, or Java ME (Sun’s new name for the J2ME platform), is one of the most prevalent technologies for developing mobile ...

The Java automatic garbage collection process typically operates as a low-priority thread that constantly searches memory for unreachable objects, objects not referenced by any other object reachable ...