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Applet

Applet Basics

Graphics in Applet

Displaying image in

Applet

Animation in Applet

EventHandling in

Applet

JApplet class

Painting in Applet

Digital Clock in Applet

Analog Clock in

Applet

Parameter in Applet

Applet

Communication

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Applet

Advantage of Applet

Drawback of Applet

Hierarchy of Applet

Lifecycle of an Applet:

next>>

Applet is a special type of program that is embedded in the webpage to generate the dynamic content. It

runs inside the browser and works at client side.

There are many advantages of applet. They are as follows:

l It works at client side so less response time.

l Secured

l It can be executed by browsers running under many plateforms, including Linux, Windows, Mac Os etc.

l Plugin is required at client browser to execute applet.

Do You Know ?

l Who is respon sible to manage the l i fe cycle of an applet ?

l How to perform animation in applet ?

l How to paint l ike paint brush in applet ?

l How to display digi tal clock in app let ?

l How to display analog clock in applet ?

l How to comm unicate two applets ?

As displayed in the above diagram, Applet class extends Panel. Panel class extends Container which is the

subclass of Component.

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Lifecycle methods for Applet:

java.applet.Applet class:

java.awt.Component class:

Who is responsible to manage the life cycle of an applet?

How to run an Applet?

Simple example of Applet by html file:

//First.java

import java.applet.Applet;

import java.awt.Graphics;

public class First extends Applet{

public void paint(Graphics g){

g.drawString("welcome",150,150);

}

}

Note: class must be pu blic because its object is created by Java Plugin so ftware that resides on

the browser.

1. Applet is initialized.

2. Applet is started.

3. Applet is painted.

4. Applet is stopped.

5. Applet is destroyed.

The java.applet.Applet class 4 life cycle methods and java.awt.Component class provides 1 life cycle

methods for an applet.

For creating any applet java.applet.Applet class must be inherited. It provides 4 life cycle methods of applet.

1. public void init(): is used to initialized the Applet. It is invoked only once.

2. public void start(): is invoked after the init() method or browser is maximized. It is used to start the

Applet.

3. public void stop(): is used to stop the Applet. It is invoked when Applet is stop or browser is

minimized.

4. public void destroy(): is used to destroy the Applet. It is invoked only once.

The Component class provides 1 life cycle method of applet.

1. 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.

Java Plug-in software.

There are two ways to run an applet

1. By html file.

2. By appletViewer tool (for testing purpose).

To execute the applet by html file, create an applet and compile it. After that create an html file and place

the applet code in html file. Now click the html file.

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myapplet.html

Live Demo:

Simple example of Applet by appletviewer tool:

//First.java

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);

}

}

/*

*/

c:\>javac First.java

c:\>appletviewer First.java

To execute the applet by appletviewer tool, create an applet that contains applet tag in comment and

compile it. After that run it by: appletviewer First.java. Now Html file is not required but it is for testing

purpose only.

To execute the applet by appletviewer tool, write in command prompt:

next>>

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