---

Applets

• A Java applet is a specially designed Java class which can be used within web pages to enhance them.
• A browser enabled with Java technology can download the applet from the internet and run it.
• Applets have strict security rules that are enforced by the Web browser.

---

Applet Tag

• Applets can be added into web pages by using applet tag.

Example:

            <APPLET code=className width=w height=h alt="alternate Text" >
                <PARAM name=pname value=val >
                -----
            </APPLET>

Where
Code - A URL of applet class.
Height - Height to display the applet.
width - Width to display the applet.
al - Alternate text to be displayed in case browser does not support applet.

• Param tag is used to pass additional parameters to applet

---

Life cycle methods for Applet

• When Browser finds Applet tag in webpage.
• It downloads the specified Applet class.
• It loads the Applet class.
• It creates Object of Applet Class.
• It calls its different methods on different events

• There are 5 main events in life of Applet
1. init
2. start
3. paint
4. stop
5. destroy
According to these event applet container call its 5 different methods.

• public void init()
• Is used to initialized the Applet.
• It is invoked only once.
• public void start()
• Is invoked when Applet scrolls into View or Restored.
• It is used to start the Applet.
• public void stop()
• Is used to stop the Applet.
• It is invoked when Applet scrolls out of view or browser is minimized.
• public void destroy()
• Is used to destroy the Applet.
• It is invoked only once.
• public void paint(Graphics g)
• is used to paint the Applet. It provides Graphics class object that can be used for drawing oval, rectangle, arc etc.

---