import java.awt. *;

public class Hwa4 extends java.applet.Applet implements Runnable
{

  private Button mybutton;
  private boolean onbutton = false;
  private Font newfont;
  private int inc = 1;
  public int xsize, ysize, ycoord = 0;

// determine size of applet, create buttons and fonts

  public void init ()
  {
    xsize = this.size ().width;
    ysize = this.size ().height;
    mybutton = new Button ("Press Me");
    newfont = new Font ("TimesRoman", Font.ITALIC, 30);
    add (mybutton);
  }

// paint method handles drawing

  public void paint (Graphics g)
  {

// always draw yellow box

    g.setColor (Color.yellow);
    g.fillRect (50, 50, xsize - 100, ysize - 100);

// if button is on draw text also

    if (onbutton)
      {
	g.setFont (newfont);
	g.setColor (Color.red);
	g.drawString ("Hello ", xsize / 2 - 60, ysize / 2 + ycoord);
	g.drawString ("World!", xsize / 2, ysize / 2 - ycoord);
      }
  }

// this method handles user interaction via the button

  public boolean action (Event evt, Object arg)
  {

    if (evt.target instanceof Button)

      if ("Press Me".equals ((String) arg))
	{
	  onbutton = !onbutton;
	  repaint ();
	  return true;
	}

    return false;
  }

// override update so as not to redraw background - helps flicker

  public void update (Graphics g)
  {
    paint (g);
  }

// this method contains code to set up looping text

  public void run ()
  {

// code needs to be plugged in here

  }

}