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import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;

class FrameCapture extends Frame{
    public FrameCapture(){
        Button capture = new Button("Capture");
        setLayout(new FlowLayout());
        add(capture);
        capture.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                try{
                    Image img = new BufferedImage(getWidth(), getHeight(), 
                                                  BufferedImage.TYPE_INT_ARGB);
                    Graphics g = img.getGraphics();

                    paint(g);

                    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(new FileOutputStream("aaa.jpg"));
                    encoder.encode(img);
                } catch(Exception e){
                    e.printStackTrace();
                }
            }
        });
    }

    public void update(Graphics g){
        paint(g);
    }

    public static void main(String[] args){
        FrameCapture f = new FrameCapture();
        f.setSize(400, 400);
        f.setVisible(true);
        Graphics g = f.getGraphics();

        g.drawLine(0, 0, 100, 200);
        g.drawRect(10, 20, 200, 150);
    }
}

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