paint method
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- The Paint is seldom called directly by the programmer because drawing
graphics is an event-driven process. - When an applet executes, the paint method is automatically called (after calls to the JApplet’s init and start methods).
- For paint to be called again, an event must occur (such as covering and uncovering the applet).
- Similarly, when any Component is displayed, that Component’s paint method is called.
- If the programmer needs to call paint, a call is made to the paint class repaint
method. - Method repaint requests a call to the Component class update method as
soon as possible to clear the Component’s background of any previous drawing, then
update calls paint directly. - The repaint method is frequently called by the programmer to force a paint operation.
- Method repaint should not be overridden because it performs some system-dependent tasks.
- The update method is seldom called directly and sometimes overridden. Overriding the update method is useful for “smoothing” animations public void repaint() public void update( Graphics g )
- Method update takes a Graphics object as an argument, which is supplied automatically by the system when update is called.
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