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[java] multiplayer in sync

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At the moment i an using sockets and writing to output to develop a fast paced game with Java3D over a network. How do you synchronize the action on all of the players screens using this, or another method?

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You need to write it as client/server. The client sends input to the server, then the server processes the input and sends a state change object back to all players connected. Every now and then you might also want the server to sync everyone, by sending a complete state object. Since everyone will be playing the same level, at its simplest, the only state changes will be players moving. Even if you have lots of objects like weapons and ammo, you only send anything on those if their position changes.

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