Is there a way to play Orcs and Elves on PC or Android?

According to Wikipedia Orcs and Elves was originally released on Nintendo DS and 'Mobile Phone', the latter of which is likely the version from which these .jar. files you're talking about are from.

The 'Mobile Phone' version predates a lot of today's Smartphones, and thus isn't an indicator that it will run natively on your mobile phone today. That old .jar file is likely built for a specific version of the Java ME system, trying to find that exact version and then trying to get that working on a PC or Android device will be a difficult task.

So despite the 'Mobile Phone' version existing, it may just be simpler to run the Nintendo DS version of the game. You can either:

• Pick up a (fairly cheap) DS from second-hand electronics, gaming or thrift stores
• Buy a Nintendo 3DS (which runs DS games)
• Run the game through an emulator. for example, nds4droid on Anrdoid or DeSmuME on PC.

The reason this will be simpler is that as far as the game is concerned it's running on the 'same' hardware as a Nintendo DS (even if under the hood it's emulated).