Java Code:
import java.util.ResourceBundle;

import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

/*
 * This example builds on HelloWorld1 and demonstrates how to draw directly
 * on an SWT Control.
 */
public class HelloWorld5 {

  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new HelloWorld5().open(display);
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }

  public Shell open(Display display) {
    final Color red = new Color(display, 0xFF, 0, 0);
    final Shell shell = new Shell(display);
    shell.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent event) {
        GC gc = event.gc;
        gc.setForeground(red);
        Rectangle rect = shell.getClientArea();
        gc.drawRectangle(rect.x + 10, rect.y + 10, rect.width - 20,
            rect.height - 20);
        gc.drawString("Hello_world", rect.x + 20,
            rect.y + 20);
      }
    });
    shell.addDisposeListener(new DisposeListener() {
      public void widgetDisposed(DisposeEvent e) {
        red.dispose();
      }
    });
    shell.open();
    return shell;
  }
}