How to change the image of a JButton?

I'm working on a memory game program. I have 30 JButtons on a JPanel. When the user is clicking and finds a match (meaning two buttons with the same image) I want to change the image on the JButton to a different image. However this does not happen while the program is running. How can I do this? I was doing this: cards[i].setIcon(cardBack); where cardBack is an ImageIcon that I already have.
That is the correct way to change an icon. Your error is probably somewhere else in the code.

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