Java Coffee Break Newsletter Volume 1 Issue 01

Published in

· 9 months ago

                Java Coffee Break Newsletter Vol 1, Issue 1 
                             ISSN 1442-3790 

 Welcome to the first Java Coffee Break Newsletter! This is the first    in a series of monthly newsletters that bring you the latest updated   to JCB, as well as information and news for the Java Developer. 

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Java Coffee Break Updates 

 * We've moved! 
 * New Java Servlet Archive 
 * Java Development Software 

1. We've moved! 
  
   The new location for the Java Coffee Break is      http://www.davidreilly.com/jcb/ 

   Please update your bookmarks, and if you are a PointCast Connections     subscriber, you'll need to remove your current channel, and     re-subscribe. 

2. New Java Servlet Archive 

   Java developers can now access free servlet source-code, from JCB's     Servlet Archive. You can access the servlet archive from the      following URL : http://www.davidreilly.com/jcb/servlets/ 

   If you've written a servlet, and would like to post your source-code     so that others can learn from your example, let us know. 

3. Java Development Software 

   JCB now features useful Java development tools, on its software      page. If you've used a cool development tool, that you think other     Java programmers should know about, drop us a line. 

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Java Q & A 

Question : How can I create a modal dialog box? 

Modal dialog boxes are extremely useful for display alert messages,  and for capturing the user's attention. You can create a simple modal  dialog box, and then it will remain visible and will maintain focus  until it is hidden (usually when the user clicks on a button). Here's  a simple example. 

import java.awt.*; 
import java.awt.event.*; 

public class DialogExample { 
	private static Dialog d; 

	public static void main(String args[]) 
	{ 
		Frame window = new Frame(); 

		// Create a modal dialog 
		d = new Dialog(window, "Alert", true); 

		// Use a flow layout 
		d.setLayout( new FlowLayout() ); 

		// Create an OK button 
		Button ok = new Button ("OK"); 
		ok.addActionListener ( new ActionListener() 
		{ 
			public void actionPerformed( ActionEvent e ) 
			{ 
				// Hide dialog 
				DialogExample.d.setVisible(false); 
			} 
		}); 

		d.add( new Label ("Click OK to continue")); 
		d.add( ok ); 

		// Show dialog 
		d.pack(); 
		d.setVisible(true); 
		System.exit(0); 
	} 
} 

The most important part of the program is the line that initializes  the dialog. Notice the parameters we pass to it. The first parameter  is a parameter for a window, and the second the title for the dialog.  The final parameter controls whether the dialog is modal or not (true  modal, false non-modal). 

    d = new Dialog(window, "Alert", true); 

Using dialogs is easy, and can communicate information to users  effectively. For those wishing to use the example, remember that it  requires JDK1.1 or higher, as it uses an inner class for the button. 

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 The Java Coffee Break Newsletter is only sent out to email subscribers   who have requested it. If you no longer wish to receive the JCB    Newsletter, please unsubscribe using the WWW form located at   http://www.davidreilly.com/jcb/newsletter/unsubscribe.html