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In every applet or windows application, the windowing system creates an Image with a Graphics object to keep track of the state of the window.
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In order to draw or write text to the window, you must override the paint method:
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In this method you put everything you want to draw in the window. The Graphics object g has things like a current color and current font, and there are methods for you to change these as well as draw.
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The window system can be interrupted for various reasons - the user resized it or some other window was put on top of it and then removed - and it does not save a copy of the pixels. Instead it calls a method called update, which blanks the screen and then calls paint(g). So even if you only draw one window, paint can be called many times.
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