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Specifically, which class should I put my ArrayList in?

I may be overthinking this. Technically it’ll be accepted if I squeezed everything into the Client class. Should my arraylist be stored in the client or should I create a class where I manage all the arrays and stuff, say a DataManager. And then create an object of this DataManager in the client where I can send things to the menu etc?

I’ve tried setting it as a class variable in the Client for now.