Difference between repaint() and paint()

also i wanna know what it does inside the paint(), repaint() and update()
Can anyone give me some links about this?
Thank you.

To expand briefly on what patrix3 already said:
The GUI thread will automatically call update() to correct painting issues (such as when areas of the screen become damaged due to objects moving on top of them, etc.). However, the programmer can specify when a region needs to be repainted by calling repaint(); this does not immmediately make a call to update(). Rather, the GUI is informed that a call to update is requested, and it executes when it can (this usually happens so fast that it seems as if repaint() immediately calls update(), but there's an important reason why it doesn't).
update() does nothing more than clear the screen and then call paint(). The version of update patrix3 gave simply ommits the screen clearing (which can cause flickering).
If multiple requests are made to repaint() before the GUI thread gets to them, then it will only execute the last one, the other requests are ignored. This is important because otherwise the GUI thread could 'fall behind' in trying to repaint the screen, if many calls to repaint() have been made.

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