Let's see if I can think of a couple.
Ever programmed the thermostat in your house? There is a good chance that the program was written in java.
How about the menu on your cell phone? - Yup probably java.
And those pesky little computers that control just about everything in your car. Lots of java there.
And your palm pilot . . .
And your VCR . . .
And your digital watch . . .
etc.
We have a forum here dedicated to J2ME at
Java 2 Micro Edition forum. They can tell you all about how to get started.