求Applet中paint,repaint,update的联系和区别。

CFree 2002-04-22 11:59:37

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public void repaint()
Repaints this component.
This method causes a call to this component's update method as soon as possible.

public void update(Graphics g)
The AWT calls the update method in response to a call to repaintupdate or paint(not paint method).
The updatemethod of Component does the following:

Clears this component by filling it with the background color.
Sets the color of the graphics context to be the foreground color of this component.
Calls this component's paint method to completely redraw this component.

public void paint(Graphics g)
Paints this component.

repaint->update->paint

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repaint,update和paint 这三个方法在Component中定义,由于awt,swing组件都直接或间接继承自Component,所以几乎所有的awt,swing组件都有这三个方法.这三个方法主要是用于组件的界面绘制. 这三个方法执行顺序repaint() - update() - paint() 一般在程序中我们都会重装paint()方法以执行重绘画面的动作,但实际上除了pa

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