public class Login
{
    Display display = new Display ();
    final Shell shell = new Shell (display);
 
    final Label welcomeLabel, label1, label2;
    final Button button1;
    final Text textField1, textField2;
 
    public Login()
    {
 
 
        label1 = new Label(shell, SWT.BOLD);
        label1.setText("Investigator ID: ");
        label1.setSize(100,20); // (width, height)
        label1.setLocation(20,60); // (x,y) co-ordinates
 
        textField1 = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.WRAP);
        textField1.setSize(90,20); // (width, height)
        textField1.setLocation(120,60); // (x,y) co-ordinates
        textField1.setTextLimit(4);
 
        textField1.addListener(SWT.KeyDown, new Listener()
        {
            public void handleEvent(Event event){}
        });
 
        textField1.addListener(SWT.Traverse, new Listener()
        {
            public void handleEvent(Event event)
            {
                event.doit = true;
            }
        });
 
        button1 = new Button(shell, SWT.BUTTON1);
        button1.setSize(90,30); // (width, height)
        button1.setLocation(220,75); // (x,y) co-ordinates
        button1.setText("Login");
        button1.addSelectionListener(login);
 
        shell.setSize(340, 340); // (width, height)
        shell.setImage(img1);
        shell.setText("Login");
        shell.open ();
 
        shell.addListener(SWT.Close, new Listener()
        {
            public void handleEvent(Event event)
            {
 
            int style = SWT.APPLICATION_MODAL | SWT.YES | SWT.NO;
            MessageBox messageBox = new MessageBox(shell, style);
            messageBox.setText("Closing");
            messageBox.setMessage("Do You Wish to Close the Application?");
//event.doit = messageBox.open() == SWT.YES;
 
            int response = messageBox.open();
 
            switch (response)
            {
                case SWT.YES:
                System.exit(0);
                case SWT.NO:
                // tried to just go back to login screen
 
 
            } // end switch
        } // end handle event
    }); // end addListener
 
        while (!shell.isDisposed ())
        {
            if (!display.readAndDispatch ()) display.sleep();
        }
        display.dispose ();
        new Shell(); // call another class that opens another shell
 
 
    } // end constructor
 
SelectionListener login = new SelectionListener()
{
    public void widgetSelected(SelectionEvent arg0)
    {
    String response1 = textField1.getText();
    String response2 = textField2.getText();
    if (!response1.equals("") && !response2.equals(""))
    {
        new Database(response1, response2);
        shell.close();
    }
 
else
    {
        MessageBox messageBox = new MessageBox(shell, SWT.ICON_WARNING);
        messageBox.setText("Error");
        messageBox.setMessage("You Must Enter Both Investigator ID & Password");
 
            int buttonID = messageBox.open();
    }
}
 
public void widgetDefaultSelected(SelectionEvent arg0) 
{}
}; // end SelectionListener() method