This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
An AWT GUI under exposure condition,which one or more method will b e invok when it redraw? A.paint(); B.update(); C.repaint(); D.drawing(); I think repaint will call update which in turn will call paint().Do let me know if am wrong.
update (): which clears the component to its back ground color and then calls paint(). repaint (): this method schedules a call to the update() method. This entire mean is that a request flag is set in the GUI thread. Every 100 milliseconds the GUI thread checks the flag. No matter how many requests are made during any 100 milliseconds only a single call is made to update (). The call to the repaint () method ends immediately. The call to the repaint () method only schedules a repainting of the component. AWT thread should eventually call the update () method to perform the actual repainting of the component. The repaint() method is overloaded. The no-args version of repaint() does not cause your user interface to repaint right away. In fact, when repaint() returns, your component has not yet been repainted - you��ve only issued a request for a repaint(). There is another version of repaint() that requests the component to be repainted within a certain number of milliseconds. If not overridden the update method clears the background and calls paint(); By overriding the update method, any previously drawn graphics will not be cleared. This is only a trivial way of preserving any graphics drawn. If the application is resized or the drawing area covered in some way the graphics will be cleared.
Hope this helps. Tracy
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