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Comments such as this:

    // Display results

followed by a chunk of code should better be factored out into a method of its own, usually getting their names from the comment itself.

DRY: Don't repeat yourself. Repeating instances of dealer.pushNewCard(0, deck1.popLastCard()) should move in to a function. Also note that that function can be a method of an object that contains both deck and player. Also note that method names containing implementation details like push or pop and the magic constant 0 are clues that that behavior needs to be encapsulated.

The same is true for you main() method. 2 players and a deck are asking to be moved into a class BlackJackGame or some other name.