Displaying a JFrame at the centre of the screen

Question

Hi,
I ve developed a GUI,
i want it to display at center of the screen each time i run the application,
i ve tried several options, but none of them works..
first i set the location of jframe..didnt work!!
{color:#ff0000}
this.setLocation(500,500);{color}
then i used this.. not working..
{color:#ff0000}
this.setLocationRelativeTo(null);{color}
then i wrote separate method n call it in my initialize().. still not working
{color:#ff0000}
Toolkit tk = Toolkit.getDefaultToolkit ();
Dimension screen = tk.getScreenSize ();
int lx = (int) (screen.getWidth () * 3/8);
int ly = (int) (screen.getHeight () * 3/8);
f.setLocation (lx,ly);{color}
if anyone can help me, pls reply..
thanks,
dush

Answer 1

hi,
here is the complete code,
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JSplitPane;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.Rectangle;
import javax.swing.ImageIcon;
import java.awt.Dimension;
import java.awt.*;
public class index extends JFrame {
     private static final long serialVersionUID = 1L;
     private JSplitPane jSplitPane = null;
     private JSplitPane jSplitPane1 = null;
     private JPanel jPanel = null;
     private JButton jButton = null;
     private JButton jButton1 = null;
     private JLabel jLabel = null;
     public index() {
          super();
          initialize();
     private void initialize() {
          this.setLocation(500,500);
          this.setContentPane(getJSplitPane());
          this.setLocationRelativeTo(null);
          this.setBounds(new Rectangle(500, 500, 462, 305));
          this.setTitle("GUI");
          this.setSize(new Dimension(462, 305));
          this.setResizable(false);
          this.setPreferredSize(new Dimension(350, 500));
          this.setVisible(true);
          centerFrame (this);
     private JSplitPane getJSplitPane() {
          if (jSplitPane == null) {
               jSplitPane = new JSplitPane();
               jSplitPane.setDividerLocation(150);
               jSplitPane.setDividerSize(0);
               jSplitPane.setRightComponent(getJSplitPane1());
          return jSplitPane;
     private JSplitPane getJSplitPane1() {
          if (jSplitPane1 == null) {
               jSplitPane1 = new JSplitPane();
               jSplitPane1.setDividerLocation(250);
               jSplitPane1.setOrientation(JSplitPane.VERTICAL_SPLIT);
               jSplitPane1.setTopComponent(getJPanel());
               jSplitPane1.setDividerSize(0);
          return jSplitPane1;
     private JPanel getJPanel() {
          if (jPanel == null) {
               jLabel = new JLabel();
               jLabel.setBounds(new Rectangle(66, 39, 179, 38));
               jLabel.setText("  GUI ");
               jPanel = new JPanel();
               jPanel.setLayout(null);
               jPanel.add(getJButton(), null);
               jPanel.add(getJButton1(), null);
               jPanel.add(jLabel, null);
          return jPanel;
     private JButton getJButton() {
          if (jButton == null) {
               jButton = new JButton();
               jButton.setBounds(new Rectangle(98, 92, 104, 50));
               jButton.setIcon(new ImageIcon(getClass().getResource("/images/mail.jpg")));
               jButton.setText("GUI");
               jButton.addActionListener(new java.awt.event.ActionListener() {
                    public void actionPerformed(java.awt.event.ActionEvent e) {
                         first ff=new first();
                         ff.setVisible(true);
                         dispose();
          return jButton;
     private JButton getJButton1() {
          if (jButton1 == null) {
               jButton1 = new JButton();
               jButton1.setText("Exit");
               jButton1.setBounds(new Rectangle(134, 184, 55, 26));
               jButton1.addActionListener(new java.awt.event.ActionListener() {
                    public void actionPerformed(java.awt.event.ActionEvent e) {
                         System.exit(0);
          return jButton1;
      void centerFrame (JFrame f) {
              // Need the toolkit to get info on system.
              Toolkit tk = Toolkit.getDefaultToolkit ();
              // Get the screen dimensions.
              Dimension screen = tk.getScreenSize ();
              // Make the frame 1/4th size of screen.
              int fw =  (int) (screen.getWidth ()/3);
              int fh =  (int) (screen.getWidth ()/4);
              f.setSize (fw,fh);
              // And place it in center of screen.
              int lx =  (int) (screen.getWidth ()  * 3/8);
              int ly =  (int) (screen.getHeight () * 3/8);
              f.setLocation (lx,ly);
            } // centerFrame
}  //  @jve:decl-index=0:visual-constraint="56,39"Edited by: dush82 on Oct 3, 2007 11:02 PM
Edited by: dush82 on Oct 3, 2007 11:10 PM