Java Applets: Introduction, Creation, Lifecycle and Example

JAVA APPLETS
Presented By : Shatakshi Agarwal

CONTENT
Introduction
Creation of Applets
Pros & Cons
Applet class
Applet lifecycle diagram
Example

Introduction
Java programs are divided into two main categories , applets
and applications .
An application is an ordinary java program.
An applet is a kind of java program that can be run across the
internet .
Applets are mainly used convert a static web page to dynamic
page.
Web is created with the help of hypertext markup language
(HTML).

Web site is collection of webpages of a particular organization.
A browser is a software which is used to browse the internet ie.,
used to view web pages.
Applets do not use main () method.
Applets needs html code to run .
Applets are run by java enabled web browser.
Java Plug-in software is responsible to manage the life cycle of
an applet.

There are two ways to run an applet :
By html file.
By appletViewer tool (for testing purpose).
The java.applet.Applet class four (init() , start() , stop() , destroy())
life cycle methods.
Java.awt.Component class provides one (paint()) life cycle methods
for an applet.

Creation Of Applets
In order to create an applet the following steps are to be
followed :
Create a class by extending applet class.
Override any one of the applet class method .
Compile the program to obtain the class file .
Create a html document and embed the
applet.
Run the applet along with the html page in
java enabled web browser.

Pros & Cons
PROS -
It works at client side so less response time.
Secured.
It can be executed by browsers running under many
plateforms ,including linux , windows , mac Os etc.
CONS –
Plugins is required at client browser to execute applet.

Applet Class
To deal with applets in java a special class is defined in java.applet
package called as Applet.
Applet class contains five special methods :
Init() – used for initialization of applet.
Start() – used to start an applet .
Paint() – used to paint the contents of the applet on the
window.
Stop() – used to stop an applet .
Destroy() – used to destroy an applet.

Example :Applet by html file
import java.applet.Applet;
import java.awt.Graphics;
public class First extends Applet
{
public void paint(Graphics g)
{
g.drawString("welcome",150,150);
}
}

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

Example : Applet by applet
viewer tool
import java.applet.Applet;
import java.awt.Graphics;
public class First extends Applet
{
public void paint(Graphics g)
{
g.drawString("welcome to applet",150,150);
}
}

Java Applets: Introduction, Creation, Lifecycle and Example

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