import java

Applet: program that runs inside a web browser

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.JApplet;

/*
	An applete that draws two rectangles.
*/
public class RectangleApplet extends JApplet  //You extend JApplet, not JComponent
{
	public void paint(Graphics g)   //It is not paintComponent
	{
            //RecoverGraphics2D
	    Graphics2D g2 = (Graphics2D) g;

	    //Construct a rectangle and draw it. 
	    Rectangle box = new Rectangle(5, 10, 20, 30);
	    g2.draw(box);

	    //Move rectangle 15 units to the right and 25 units down
	    box.translate(15, 25);

	    //Draw moved rectangle
	    g2.draw(box);
	}
}

<html>
<head>
<title>Two rectangles</title>
</head>
<body>
<p>
Here is my <i>first applet</i>:
</p>
<applet code ="RectangleApplet.class" width="300" height="400">
</applet>
</body>
</html>

1. Compile the RectangleApplet.java file

2. (a) Open html file by a browerser, ex. Firfox
(b) Run appletviewer like below
appletviewer RectangleApplet.html