JPanel(LayoutManager layout, boolean isDoubleBuffered) constructor from JPanel has the following syntax.
public JPanel(LayoutManager layout, boolean isDoubleBuffered)
In the following code shows how to use JPanel.JPanel(LayoutManager layout, boolean isDoubleBuffered) constructor.
/*from w ww . j a v a 2 s . c om*/ 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); } }