This document provides an overview of Java applets, including: - An applet is a Java program that runs in a web browser and is embedded in an HTML page. It must subclass the Applet class. - There are two types of applets: local applets stored on the local system and remote applets stored on remote, internet-connected systems. - Advantages of applets include platform independence, fast loading, and security features. Disadvantages include lack of support in some browsers and restrictions on accessing client resources. - Applets differ from standalone Java applications in that they don't use a main method, run from HTML, and have restrictions on file/network access and native libraries.

1. Object Oriented
Concepts
Name : Dhimanth Shetty
USN : 1SU20CS012

2. CONTENT
 Introduction to Applets
 What is java Applet?
 Types of Applets
 Advantages of applets
 Disadvantages of applet
 How applets differ from applications
 Preparing to write applets

3. Introduction to Applets
An applet is a special Java program that runs in a browser
enabled with java technology(JRE) that can be downloaded
from internet and run. An applet is typically embedded
inside a HTML page and runs in context of a browser . An
applet is designed to run remotely in the client browser, so
there are some restrictions on it . An applet must be a
subclass of the java.applet.Applet class . the applet class
provides the standared interface between the applet and
the browser environment

4. What is Java Applet ?
Java applets are the small applications written in the java
programming language or another programming language
that complies to java bytecode and delivered to users in the
form of java bytecode

5. Types of Applets in Java

6. Local Applet
 Here we create our own web page and embed applet in it .
In another way we download an applet from a remote
computer system and then embed it in our web page .
 Such applet which has been developed on the local
computer and that applet is stored on the same local
system then this type of applet is called Local Applet
 When a local web page searches for a local applet it is not
necessary to be connected to the internet . Such a web
page usually searches all the directories of the local
computer and finds applet and local it in the web page

7. Remote applet
 A remote applet is an applet that has been developed by
another developer and stored on a computer system that
is connected to the internet .
 If our computer is connected to the internet then we can
download that remote applet through the internet and run
it on our local computer system.
 In order to find the remote applet placed on a remote
computer and load it in the web browser of the computer
system ,we need to know the web address of that applet

8. Advantages of Applets
 Applets don’t have concordance objects with different
versions of java
 Applets cache quickly, that’s why there will be no latency
in downloading of them.
 It can also be resort as a real time application.
 Java has constituted security, by this feature of java; an
applet doesn’t produce any harmful activity to your
computer.
 Database integration is another important advantage of
applets.

9. Disadvantage of Applet
 Some browsers especially mobile browsers which are
running on Apple IOS or Android don’t support applets run.
 Applets have to tag as trusted applets and they must be
registered to APS (Applet Security Manager).
 Applet cannot work with native methods.
 Applet can only extract information about client-machine
is its name, java version, OS, version etc.
 Applets don’t access client-side resources, like-
1. Files
2.Operating system

10. How Applets Differ from Applications
 There are significant difference between applets and
stand java applications applets are not full featured
applications programs .
 Applets are usually written to accomplish a small task or
a component of a task.
 They are designed for use on the internet they impose
certain limitation and restriction in their design
They are:

11. 1.main() methods are not used in any applets as it is not
required for initiating the execution of code.
2.Applets are run from inside a web page using a special
feature known as HTML tag.
3.Files that are located in the local computer cannot be read
or written by applet.
4.Applets cannot communicate with other servers on the
network
5.Applets cannot run any programs from the local computer
6.Applets are restricted from using libraries from other
language such as C and C++.

12. Preparing to write Applets
 Until now we were creating a simple java program using
single main() method that created other objects ,set
instance variables and ran methods . To write any applets
we will need to know :
1.When to use applets
2.How an applet works
3.What sort of features an applet has
4.Where to start , when we first create our own applet

13.  The following are the steps that are involved in
developing and testing an applet:
1.Building an applet code(.java file)
2.Creating an executable applet(.class file)
3.Designing a web page using HTML
4.Preparing<Applet tag>
5.Incorporating<Applet>tag into web page
6.Creating a HTML file
7.Testing the applet code.

14. Thank You