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You're welcome.

Call the class what it is: Pack. The deck.add() stuff belongs in its constructor - what you posted won't compile. (Which might explain compiler's grumbling. Statements have to go inside a method...

Consider making a Pack class to represent a pack of cards. (One class: one thing. Whatever sort of thing this Main class is, it is unlikely it is a pack of cards.)

Then give Pack a shuffle()...