Welcome to J2ME,

 Java underwent series of changes through out its life.One major change is introduction of Java into mobile devices.

The explosion of mobile device usage along with J2ME provided many developers never before reach into lives of common man.Yes,that obviously is the main advantage of Java ..as SUN will put it "Write Once Run Anywhere" .This amazing reach which is fuelled by absence of need for recompilation when run on different operating systems  made it a favourite platform for may developers.