You should avoid using strings to control your logic when there are better types available. (Using strings for everything is called stringly typed code and is considered an antipattern.) A better choice for representing the values cards can have would either be a simple int or an enum. I'd probably use an int between 2 and 9 for the numbered cards and use 10, 11, 12, and 13 for jack, king, queen, and ace.
I'd use an enum to represent the suits: hearts, spades, diamonds, and clubs. Something like this:
public enum Suit {
HEARTS, SPADES, DIAMONDS, CLUBS
}
As suggested in the comments, I'd create a Card class. Each object in the Card class would have a Suit and a value between 2 and 13 inclusive. You could create a Deck class that held all 52 cards. It could have methods for shuffling the cards and dealing cards.
CardorDeckclass or whatever, then ensure that the correct image is loaded for the correct card.Cardobject to have a value field?