计算与软件工程I15GUI
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Make your own drawing widget
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• Make a subclass of JPanel and override one method, paintComponet().
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15 GUI
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• Any time the JVM thinks the display needs refreshing, your pintComponent() method will be called.
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Inner class
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Inner object must be tied to a specific outer object on heap
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• Think of the paintComponent() method as the method called by the system to say, “Hey widget, time to paint yourself.”
• When the frame holding your drawing panel is displayer, paintComponet() is called and your circle appears. If the user iconifies/minimizes the window, the JVM knows the frame need “repair” when it gets de-iconified, so it calls paintcomponent() again.
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Graphics
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How to make an instance of an inner class
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Hale Waihona Puke Baidu33
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Getting a user event
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