CentOS - Convert swap memory to regular?

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http://serverfault.com – Take a look at this screenshot that I took after doing free -m: http://gyazo.com/aa54d264956e56acb99024e2374de0c0.png?1340387738 I notice that I have a ton of swap memory not being used, could I convert that to something that CAN be used? I'm sort of a noob with this, sorry if it's a stupid question. Also, when doing top as outlined in Who is using the swap memory and why? I see that java is only using 47.8% of my systems memory. My java process is being used to run a game, and the players are always lagging out. Is there a way to increase this so it has to use more so my players don't lag? (HowTos)