SWT

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;

public class HelloWorld 
{
   public static void main (String[] args) 
  {
      Display display = new Display();
      Shell shell = new Shell(display);
      Label label = new Label(shell, SWT.NONE);
      label.setText("Hello World");
      label.pack();
      shell.pack();
      shell.open();
      while (!shell.isDisposed()) 
      {
         if (!display.readAndDispatch()) display.sleep();
      }
      display.dispose();
   }
}