import javax.swing.*;

 import java.awt.*;

 import javax.swing.border.EtchedBorder;

 public class TryGridLayout {

   public static void createWindow(){

     JFrame aWindow = new JFrame("This is the Window Title");

     Toolkit theKit = aWindow.getToolkit();                             // Get the window toolkit

     Dimension wndSize = theKit.getScreenSize();                        // Get screen size

     // Set the position to screen center & size to half screen size

     aWindow.setSize(wndSize.width/2, wndSize.height/2);                // Set window size

     aWindow.setLocationRelativeTo(null);                               // Center window

     aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

     GridLayout grid = new GridLayout(3,4,30,20);                       // Create a layout manager

     Container content = aWindow.getContentPane();                      // Get the content pane

     content.setLayout(grid);                                           // Set the container layout mgr

     EtchedBorder edge = new EtchedBorder(EtchedBorder.RAISED);         // Button border

     // Now add ten Button components

     JButton button = null;                                             // Stores a button

     for(int i = 1 ; i <= 10 ; ++i) {

       content.add(button = new JButton(" Press " + i));                // Add a Button

       button.setBorder(edge);                                          // Set the border

     }

     aWindow.pack();                                                    // Size for components

     aWindow.setVisible(true);                                          // Display the window

   }

   public static void main(String[] args) {

     SwingUtilities.invokeLater(new Runnable() {

             public void run() {

                 createWindow();

             }

         });

   }

 }