Displayed a message box then removed it by a program without user action

Question

Can a message box be displayed by a program and then removed by the program without any user action such as clicking OK or closing the box?
If so, will you show us how to do that?
I have a non-GUI application which needs to tell the user to wait while classes and being created and data is being loaded from the network. The message needs to disappear when the program is ready.
Thanks!

Answer 1

Here is an example of using the JDialog you will have to make it look like you want I just pieced this together real quick
import javax.swing.*;
public class test extends Object
    public test()
        longOperation();
        System.exit(0);
    public void longOperation()
        JDialog dialog = new JDialog();          
        dialog.getContentPane().add(new JLabel("Wait"),java.awt.BorderLayout.CENTER);
        dialog.setSize(200,200);
        dialog.setVisible(true);
        // used to simulate a long operation
        Thread t = Thread.currentThread();
        try
            t.sleep(2000);
        }catch(Exception e){}
        dialog.dispose();
    public static void main(String args[])
        new test();  
}