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   @Override
public void update(Graphics g) 
{
if(offScreenImage == null)
{
offScreenImage = this.createImage(800, 600);
}
/*
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*/

Graphics graOffScreen = offScreenImage.getGraphics();

/*
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*/
Color c = graOffScreen.getColor();
graOffScreen.setColor(Color.GREEN);
graOffScreen.fillRect(150, 150, 800, 600);
graOffScreen.setColor(c);


paint(graOffScreen);

g.drawImage(offScreenImage, 0, 0, null);
}


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StreamReader   sr=new   StreamReader(@"F:\cym\temp\1.txt");  
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package chape8;
/**
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* for-eachÑ­環優ÏÈÓÚforÑ­環
* for(Element e : c)
* {
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