1 // Sketching application
 2 import javax.swing.*;
 3 import java.awt.*;
 4 import java.awt.event.*;
 5
 6 public class Sketcher {
 7   public static void main(String[] args) {
 8      theApp = new Sketcher();                                          // Create the application object
 9    SwingUtilities.invokeLater(new Runnable() {
10             public void run() {
11               theApp.createGUI();                                      // Call GUI creator
12             }
13         });
14   }
15
16   // Method to create the application GUI
17   private void createGUI() {
18     window = new SketcherFrame("Sketcher");                            // Create the app window
19     Toolkit theKit = window.getToolkit();                              // Get the window toolkit
20     Dimension wndSize = theKit.getScreenSize();                        // Get screen size
21
22     // Set the position to screen center & size to half screen size
23     window.setSize(wndSize.width/2, wndSize.height/2);                 // Set window size
24     window.setLocationRelativeTo(null);                                // Center window
25
26     window.addWindowListener(new WindowHandler());                     // Add window listener
27     window.setVisible(true);
28   }
29
30   // Handler class for window events
31   class WindowHandler extends WindowAdapter {
32     // Handler for window closing event
33     @Override
34     public void windowClosing(WindowEvent e) {
35       window.dispose();                                                // Release the window resources
36       System.exit(0);                                                  // End the application
37     }
38   }
39
40   private SketcherFrame window;                                        // The application window
41   private static Sketcher theApp;                                      // The application object
42 }