Java AWT Toolkit get screen size and center window

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class Main extends JComponent {

  protected static void displayGUI(final String title, final JComponent component) {

    // create window with title
    final JFrame frame = new JFrame(title);

    // set window's close button to exit application
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // place component in the center using BorderLayout
    frame.getContentPane().add(component, BorderLayout.CENTER);

    // size window based on layout
    frame.pack();/*from ww  w .j  av a 2  s . co  m*/

    // center window
    Dimension scrnSize = Toolkit.getDefaultToolkit().getScreenSize();
    int scrnWidth = frame.getSize().width;
    int scrnHeight = frame.getSize().height;
    int x = (scrnSize.width - scrnWidth) / 2;
    int y = (scrnSize.height - scrnHeight) / 2;

    frame.setLocation(x, y);
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    final Main c = new Main();
    c.setPreferredSize(new Dimension(290, 227));
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        displayGUI("Creating a GUI", c);
      }
    });
  }
}