Java JPanel(LayoutManager layout, boolean isDoubleBuffered) Constructor

public JPanel(LayoutManager layout,  boolean isDoubleBuffered)

/*  ww w  . ja  v a 2  s  . c o  m*/
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {

  public static void main(String[] a) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel buttonPanel = new JPanel(new FlowLayout(),true);
    buttonPanel.add(new JButton("A"));

    frame.add(buttonPanel);

    frame.setSize(300, 200);
    frame.setVisible(true);
  }

}