Java Applet

A Java Applet is a sort of software that is embedded in a webpage to generate dynamic content. It operates on the client side and runs within the browser.

All applets are subclasses (either directly or indirectly) of java.applet.Applet class.
Applets are not independent programs. They instead run in a web browser or an applet viewer. Applet viewer is a standard applet viewer tool provided by JDK.
In general, an applet’s execution does not begin with the main() method.
System.out.println does not conduct applet window output (). Rather, it is handled via AWT methods such as drawString ().
Java Applet is deprecated since Java 9. It means Applet API is no longer considered important.

Java Applet Lifecycle:

The phases in Applet are as follows:

The applet has been launched.
The applet has begun.
Applet has been painted.
Applet has been terminated.
Finally, Applet has been destroyed.

Example:

import java.awt.*;
import java.applet.*;
public class Coderz extends Applet
{
  public void paint(Graphics g)
    {
      g.drawString("A simple Applet", 20, 20);
    }
}

Benefits of Applet:

Applets have numerous advantages.

It operates on the client side, resulting in a faster response time.
Secured
It can be executed by browsers operating on a variety of platforms, including Linux, Windows, and macOS.

Disadvantage of Applet:

The disadvantage of the Applet Plugin is that the client browser must execute the applet.

Class java.applet.Applet:

To create an applet, the java.applet.Applet class must be inherited. It includes four applet life cycle techniques.

The Applet is initialized using public void init(). It is only used once.
public void start(): is called when the init() function has been called or the browser has been maximized. It’s used to launch the Applet.
The function public void stop() is used to terminate the Applet. It is called when the applet is stopped or the browser is minimized.
The Applet is destroyed with public void destroy(). It is only used once.

Launching an Applet:

There are two methods for running an applet.

Using an HTML file.

<html>  
<body>  
<applet code="Coderz.class" width="300" height="300">  
</applet>  
</body>  
</html>

Using the applet viewer tool (for testing purposes).

c:\>javac Coderz.java
c:\>appletviewer Coderz.java

Note: also read about the Legacy Classes in Java

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