Java awt repaint()在移动时留下痕迹

import java.awt.*;
import java.awt.image.BufferedImage;

public class DoubleBufferingExample extends Component {
    private BufferedImage buffer; // 双缓冲区
    private Graphics2D bufferGraphics; // 双缓冲区的绘图对象

    public DoubleBufferingExample() {
        buffer = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
        bufferGraphics = buffer.createGraphics();
    }

    @Override
    public void paint(Graphics g) {
        // 在双缓冲区绘制图形
        bufferGraphics.setColor(Color.WHITE);
        bufferGraphics.fillRect(0, 0, getWidth(), getHeight());
        bufferGraphics.setColor(Color.RED);
        bufferGraphics.drawLine(0, 0, getWidth(), getHeight());

        // 将双缓冲区的图像一次性绘制到屏幕上
        g.drawImage(buffer, 0, 0, null);
    }

    public static void main(String[] args) {
        Frame frame = new Frame("Double Buffering Example");
        DoubleBufferingExample example = new DoubleBufferingExample();
        frame.add(example);
        frame.setSize(400, 400);
        frame.setVisible(true);
    }
}