February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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Method paintComponent
Lightweight Swing components that extend class JComponent (such as JPanel) contain method paintComponent, which is called when a lightweight Swing component is displayed. By overriding this method, you can specify how to draw shapes using Java’s graphics capabilities. When customizing a JPanel for use as a dedicated drawing area, the subclass should override method paintComponent and call the superclass version of paintComponent as the first statement in the body of the overridden method to ensure that the component displays correctly. The reason is that subclasses of JComponent support transparency. To display a component correctly, the program must determine whether the component is transparent. The code that determines ...
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