Depends on if you have any software installed that requires java, i dont have java on my laptop but i do have it on the desktop for the office software to function, the main key is to make sure java is always updated to the latest stable version which is 6.0.31 at the moment.
I always remove Java prior to installing the latest Java software. In other words, I do not update it and leave any old Java software behind on my machine. Some sites I go to require Java, so that is why I have it on my machine.
Well you can use Secunia PSI to check for the latest java to be installed. Java in Google chrome browser ask you before the plug-in canbe used, to allow the use of it. If you do not trust it, do not run, so deny the use of it. If you get a message that the plug-in is not the most recent version, you have to install the latest. With BetterPop up Blocker extension & Not Scripts I allow just what would run from which domain. But I advice to do some pre-scanning to know a site does not have java malware on it. And if you do not need java, do not use it,
I don’t really recommend removing it, since a lot of software and websites require Java. If you play Minecraft, I suggest you keep it. If you don’t plan on downloading software that requires Java, then you can remove it.