There are many ways to implement double buffering. One way is to not do it and instead use Swing components, such as JFrame and JPanel, that already does double buffering. Use paintComponent(Graphics) and override it the same way as you would with paint(Graphics).
class JPanelWithSmileyFace extends JPanel {
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.YELLOW);
g.fillOval(10, 10, 180, 180);
g.setColor(Color.BLACK);
g.fillOval(90-30, 50, 20, 30);
g.fillOval(90+30, 50, 20, 30);
g.drawArc(40, 40, 200-2*40, 200-2*40, -10, -160);
}
}Example paintComponent.public class SmileyFaceDemo {
public static void main(String[] args) {
JFrame window = new JFrame();
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.getContentPane().add(new JPanelWithOval());
window.pack();
window.setVisible(true);
}
}Example main.
