Java is the most used computer language in the world, while most games are NOT written with it, almost all computers are either written with it or at the very least understand it as a standard language and even if they cannot you can easily download a Java Virtual Machine. you can do just about anything with the Java language and it is very straight forward so is fairly easy to learn. i learned to do lots of amazing things with it in just a couple of months, not enough to make a game or anything but in just a couple more months i would probably have enough knowledge to at least "jerry-rig" a game. so, yea, i would say it's worth learning praticularly if it's your first computing language