Java Code:
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Text;

public class HelloSWT_JFace extends ApplicationWindow {

  public HelloSWT_JFace() {
    super(null);
  }

  protected Control createContents(Composite parent) {
    Text helloText = new Text(parent, SWT.CENTER);
    helloText.setText("Hello SWT and JFace!");
    parent.pack();
    return parent;
  }

  public static void main(String[] args) {
    HelloSWT_JFace awin = new HelloSWT_JFace();
    awin.setBlockOnOpen(true);
    awin.open();
    Display.getCurrent().dispose();
  }
}