JFrame flicker on programmatic resize.

Question

Here is the code:
package ui.components;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Test {
    public Test()
        final JFrame frame = new JFrame();
        frame.setBounds(100, 100, 300, 300);
        frame.setBackground(Color.blue);
        JPanel panel = new JPanel(new BorderLayout());
        JPanel up = new JPanel(new BorderLayout());
        up.setPreferredSize(new Dimension(100, 100));
        up.setBackground(Color.blue);
        JButton button = new JButton("add size/shrink size");
        button.addActionListener(
            new ActionListener() {
                boolean addf = true;
                public void actionPerformed(ActionEvent e)
                    if (addf) {
                        frame.setSize(
                            frame.getWidth(),
                            frame.getHeight() + 50
                    } else {
                        frame.setSize(
                            frame.getWidth(),
                            frame.getHeight() - 50
                    addf = !addf;
        up.add(button, BorderLayout.CENTER);
        JPanel bp = new JPanel();
        bp.setBackground(Color.red);
        bp.setPreferredSize(new Dimension(100, 200));
        panel.add(up, BorderLayout.CENTER);
        panel.add(bp, BorderLayout.SOUTH);
        frame.setContentPane(panel);
        SwingUtilities.invokeLater(
            new Runnable() {
                public void run()
                    frame.setVisible(true);
    public static void main(String[] args)
        new Test();
}Why the frame flickers when the button is pressed ?
I see that JFrame is filled with it's background color.
I know that "sun.awt.noerasebackground" property can be changed to fix that, but I don't want to change any global settings as the effect applies only to one frame.
Thank you.

Answer 1

Research "Double Buffering". This will not be a one liner but it will solve your problem.