java - Compile error method constructor -

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i have array list hand has stay private in class a. in class b, have method public string checkhand(arraylist<card> hand) line has stay way is. checkhand supposed check whether hand contains winning combinations , return string. when try compile class b, unfinished right now, error:

gamepoker.java:40: cannot find symbol     symbol  : class arraylist     location: class gamepoker     public string checkhand(arraylist<card> hand)

what might missing? thanks.


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