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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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public void paint(Graphics g)
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The Graphics object g has a current color and font that can be changed by methods
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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 the paint method. So even if you only draw one window, paint can be called many times.
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