How does the Applet update its window when information changes?
Whenever an applet requires to update the information displayed in its window, this simply calls repaint ( ) way. The repaint ( ) way is defined through AWT( abstract window toolkit). This causes the AWT run-time system to execute a call to applet's update( ) method that in its default implementation calls paint ( ). Therefore for other part of the applet to output to window of this, simply stores the output and after that calls repaint ( ). The AWT will after that executes a call to paint ( ).