I created a Java program to open a window and do double buffering:

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

public class DoubleBufferingExample extends Frame {
    private BufferedImage buffer;
    private Graphics bufferGraphics;

    public DoubleBufferingExample() {
        super("Double Buffering Example");
        setSize(300, 300);
        setVisible(true);
        buffer = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
        bufferGraphics = buffer.getGraphics();
    }

    public void update(Graphics g) {
        paint(bufferGraphics);
        g.drawImage(buffer, 0, 0, null);
    }

    public void paint(Graphics g) {
        // draw your image or animation here
        // using bufferGraphics instead of g
    }

    public static void main(String[] args) {
        new DoubleBufferingExample();
    }
}

However, when I try to close the window, it doesn't close. Anyone know how to fix this?

Google not working for you ?

Close frame.

I don't know why you use bare AWT Frame instead of more simple and convenient JFrame from Swing, but I suppose you have your reasons. In order to close awt window you have to add window listener in class constructor like this:

this.addWindowListener(new WindowAdapter() {

        public void windowClosing(WindowEvent evt) {
            System.exit(0);
        }

}); 

You can see this StackOverflow thread for more, but I think you should consider using swing in further development.

(You will need awt anyways, but parts that could be done by swing should be done with it in my opinion)

@Maggistrator Okay. I decided to write an example using Swing:

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

public class DoubleBufferingExample extends JPanel {
    private BufferedImage buffer;
    private Graphics2D bufferGraphics;
    
    public DoubleBufferingExample() {
        // Set up the JPanel
        setPreferredSize(new Dimension(400, 400));
        
        // Set up the double buffer
        buffer = new BufferedImage(400, 400, BufferedImage.TYPE_INT_RGB);
        bufferGraphics = buffer.createGraphics();
        
        // Draw something to the buffer
        bufferGraphics.setColor(Color.WHITE);
        bufferGraphics.fillRect(0, 0, 400, 400);
        bufferGraphics.setColor(Color.RED);
        bufferGraphics.fillOval(50, 50, 300, 300);
    }
    
    @Override
    protected void paintComponent(Graphics g) {
        // Copy the buffer to the screen
        g.drawImage(buffer, 0, 0, null);
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("Double Buffering Example");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.add(new DoubleBufferingExample());
            frame.pack();
            frame.setVisible(true);
        });
    }
}

Thanks for the tip.