public class SWT{public static void main(String[]args){
final org.eclipse.swt.widgets.Display display =
new org.eclipse.swt.widgets.Display();
final org.eclipse.swt.widgets.Shell shell = new org.eclipse.swt.widgets.Shell(display);shell.setLayout(
new org.eclipse.swt.layout.FillLayout());
org.eclipse.swt.widgets.MessageBox messageBox = new org.eclipse.swt.widgets.MessageBox(
shell,org.eclipse.swt.SWT.OK);
messageBox.setMessage(" Hola Mundo");
shell.pack();
shell.setSize(630,300);
messageBox.open();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}