import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Color;

public class AppletDemo extends Applet {

  public void init() {
    setBackground(Color.yellow);
  }

  public void paint(Graphics g) {
    int xsize = getWidth();
    int ysize = getHeight();

    g.drawString("Hello, world!", xsize / 2, ysize / 2);
    g.setColor(Color.red);
    g.drawLine(0, 0, xsize, ysize);
  }
}