What is the difference between revenge and justice? Example: Some guy holds you at gun point and wants your money. You manage to snatch the gun from him, would it be considered justice or revenge if you now rob him instead?

I don't think that justice and revenge have all that much in common. Justice is about fairness and morality: doing what is right. Revenge is about inflicting hurt or harm on someone in response to wrong suffered at their hands. But two wrongs do not make a right... acting purely out of vengefulness is rarely just at all. If someone has done something wrong then they should make it right if possible ...make an amend, redress the balance. In a just society the legal system may enforce this. But the point is not to make the wrong-doer suffer. That does no good to anyone. It is only to make things better. If you manage to snatch the gun from the would-be robber, then robbing him would be vengeful but not just.

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