How can I make an Action Listener to change JPanel icons on var change

In my game I'm making a type of AI or computer. I need labels to change under certain circumstances like a random number generator or something that determines his action.

Would I use a property change listener for something like this?

For all my actions I have used a mouse listener to change label images and such, I'm just not sure how to do it when no mouse movements or actions are taking place...