import java.awt.*; // Graphics, Color, and Font
import javax.swing.*; // JApplet and JPanel

public class HelloApplet4 extends JApplet
{ public void init()
  { getContentPane().add(new MsgPanel(500, Color.yellow)); //500 ms
  }

  public static void main(String[] args)
  { JFrame f = new JFrame("I am an Appication");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    HelloApplet4 ha = new HelloApplet4(); // create an instance of HelloApplet4
    f.getContentPane().add(ha, BorderLayout.CENTER);
    ha.init();
    ha.start();
    f.setSize(350,130);
    f.setVisible(true);
  }
}
class MsgPanel extends JPanel implements Runnable
{ private boolean show = true;
  private Thread thrd = null;
  private int msec = 1000;
  private Color c;
  public MsgPanel(int ms, Color c)
  { msec = ms;
    this.c = c;
    thrd = new Thread(this);
    thrd.start();
  }
  public void run()
  { while(true)
    { repaint();
      try
      { thrd.sleep(msec);
      }
      catch (InterruptedException ex)
      { System.out.println(ex);
      }
    }
  }
  public void paintComponent(Graphics g)
  { super.paintComponent(g); // clear VA
    g.setFont( new
       Font("Arial", Font.BOLD, 16) );
    setBackground(c);
    if(show)
       g.drawString("Hello", 100, 50);
    show = !show;
  }
} // Chung (c) 2000