[hardwired]

Code:

public void rollDice(){
    check.setIcon(Dice3);
    // If the new icon is larger/smaller than the older
    // one you might need to ask for a new layout (but
    // likely not). You just have to try and see if you
    // need it. You do that with the JComponent method
    // revalidate or the Container method validate.
    check.revalidate();  // Often not needed.
    // Generally needed for this.
    check.repaint();
}