This applet demonstrates the use of threads with graphics. The star atop the tree is
flashed on/off within a separate thread, while the main "twinkle" method selects a
random number of the lightbulbs and toggles them on/off. The bulb colors and positions
are initialized and the bulbs are drawn/erased using simple fillOval methods with the
masked bare tree image used for "cleanup" in transparency regions.
Go Home ET