How to center a frame or dialog : Frame « Swing JFC « Java

How to center a frame or dialog

How to center a frame or dialog
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

public class CenteredFrame extends JFrame {
  public CenteredFrame() {
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
    Toolkit tk = Toolkit.getDefaultToolkit();
    Dimension screenSize = tk.getScreenSize();
    int screenHeight = screenSize.height;
    int screenWidth = screenSize.width;
    setSize(screenWidth / 2, screenHeight / 2);
    setLocation(screenWidth / 4, screenHeight / 4);

  public static void main(String[] args) {
    JFrame frame = new CenteredFrame();;

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