[PDF] UNIT -1 JAVA APPLETS applet viewer or java compatible





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Java Applets Java Applets

CSD Univ. of Crete. Notion of Applets in Java. • You can write an applet by extending. • Applet class. ? Contains code that works with a browser t.



Applet in Java-converted.pdf

can use either a plug-in of the Web browser or a separate runtime environment to run an applet application. • JVM creates an instance of the applet class and 



APPLETS

The Applet class is contained in the java.applet package.Applet contains several methods that give you detailed control over the execution of your applet. In 



Applets Unit-I

The second type of applets are those based on the Swing class JApplet. Swing applets use the Swing classes to provide the GUI. Page 2. Advanced Java Programming 



INTRODUCTION TO JAVA PROGRAMMING LECTURE NOTES B

Applets – Concepts of Applets differences between applets and GUI Programming with Java – AWT class hierarchy



UNIT -1 JAVA APPLETS

applet viewer or java compatible web browser. ? Java applet is a java class that you embed in an. HTML page and is downloaded and executed by a.



Enabling Java and ActiveX Settings of Internet Explorer:

Even if the system type is of 64 bit we recommend to install only 32 bit latest java version. 10.General Exception : websigner.applet



Java Programming : applets servlets and JSP.

The Applet class is derived from the java.awt. String getParameter(String name) of theApplet class. ... This may be an HTML stream PDF



Java Card Applet Developers Guide

Industry-specific extensions. Add-on classes that extend the applets installed on the card. Applets. Programs written in the Java programming language for use 



Teach Yourself Java in 21 Days

Creating Classes and Applications in Java. 95. 7. More About Methods. 111. Week 2 at a Glance. Day. 8. Java Applet Basics.

UNIT-1

JAVAAPPLETS

TOPICSTOBECOVERED"

1 .1 Concept of Applet Programming

yLocal and Remote applets yDifference between applet and application yPreparing to write applets yBuilding applet code yApplet life cycle yCreating an executable applet

1.2 Designing a web page:

yApplet tag yAdding applet to HTML file yRunning the applet yPassing parameter to applet

11CONCEPTOFAPPLETPROGRAMMING

|Java supports two types of programming :

1) Application program:

applicationisaprogramthatrunson

Computer.

2)Appletprogram:

Anappletisanapplicationdesignedtobe

transmittedovertheInternetandexecutedbya

Java-compatibleWebbrowser.

APPLET

appletviewerorjavacompatiblewebbrowser. |Javaappletisajavaclassthatyouembedinan

HTMLpageandisdownloadedandexecutedbya

webbrowser. |AppletŃMQ·Pbeexecuteddirectly. it.

APPLET

|Wecanembedappletsintowebpagesintwoways: webpages. systemandthenembeditintoawebpage.

LOADINGORDISPLAYINGAPPLET

Java Byte code

Web page html

VM

Applet

Browser

or

Applet viewer

LOCALAPPLET

isknownaslocalapplet. andlocatesandloadsthespecifiedapplet. webpages.

LOCALAPPLET

Local applet

Local computer

REMOTEAPPLET

isknownasremoteApplet. downloadtheremoteappletontooursystemvia

Internetandthenrunit.

|Usercanthusdownloadanappletfromaremote computersystem knownasURL(UniformResourceLocator).

REMOTEAPPLET

CODEBASE= http: // www. Netserve.com

/applets |Incaseoflocalapplets,CODEBSAEmaybe absentormayspecifyalocaldirectory.

REMOTEAPPLET

Local computer

(client)Remote computer (server)

Local computer

Remote applet

Internet

Loading a remote applet

LIMITATIONSOFAPPLET

appletcannotdoanydamagetolocalsystem. loadanyDLLsonthelocalsystem. |Appletdonotneedamainmethod. |Appletrunsunderanappletviewerorajava compatiblewebbrowser. languagessuchasc,c++. thediskfromwhichthewebpageisserved.

LIMITATIONSOFAPPLET

|Appletcannotmakenetworkconnectiontoa computerotherthantheonefromwhichtheweb pageisserved,expecttodirectthebrowsertoa newlocation. |Appletcannotrunanyprogramsontheweb controlsorotherbrowserrelateditems. becauseofsecurityconcerns

WHENTOUSEAPPLET?

thedisplayofawebpage. specialeffectswouldbeusedwhendisplaying certainpages. |Whenwewanttocreateaprogramandmakeit computers.

DIFFERENCE APPLETANDAPPLICATION

|Appletisdynamicprogram whichisrunonbrowser. |Appletdonotusethemain() methodforinitiatingthe executionofthecode. |Appletscannotberun independently.Theymust berununderanapplet viewerorajavacompatible webbrowser. |Applicationisstatic programwhichrunusing javainterpreter. |Applicationusesmain() methodforexecutionof thecode. |Applicationruns independentlyusingjavac compiler.

AppletApplication

DIFFERENCE APPLETANDAPPLICATION

|Appletscannotreador writefilesonthewebXVHU·V disk. |Appletcannotcommunicate withotherserveronthe network. |Appletcannotrunany programfromthelocal computer. |Appletsarerestrictedfrom usinglibrariesfromother languagessuchasc,c++. |Applicationcanreadwrite filesonthewebXVHU·V disk. |Applicationcan communicatewithother serversonthenetwork. |Applicationprogramcan runfromlocalcomputer. |Applicationprogramcan usemethodsofc,c++ libraries.

AppletApplication

APPLETCLASS

java.awt.panel. |Java.appletissmallestpackageinJavaAPI. interfaces:AppletContext,AppletStuband

Audioclip.

lessconstructor,whichisnotusedgenerally. constructed.

APPLETCLASS

java.awt.panel. |Java.appletissmallestpackageinJavaAPI. interfaces:AppletContext,AppletStuband

Audioclip.

lessconstructor,whichisnotusedgenerally. constructed.

Java.lang.Object

Java.awt.Component

Java.awt.container

Java.awt.panel

Java.applet.Applet

MethodDescription

Image getImage(URL url):Used to retrieve an Image

identified by URL.

AudioClip getAudioClip(URL

url) :

Used to retrieve Audioclip object

that is identified by URL. void play(URL url)If an audio clip is found then play method is used to play an audio clip. void init(), void start(), void stop(),void destroy()

Used to implement each of four

life cycles stages of an applet. booleanisActive() :Return true if applet has been started else return false if it has been stopped

MethodDescription

AppletContext

getAppletContext() :

Used to obtain AppletContextObject

associated with an applet. informationaboutapplet.this includesversion,copyrightand ownershipdataaswellasapplet specificdata.

URLgetCodeBase() :ReturnsbaseURLspecifyingthe

MSSOHP·Vlocation.

URLgetDocumentBase():Returns the URL of the HTML

document in which the applet is contained. voidsetStub(AppletStub stubObj):

UsedtosettheAppletStub

associatedwiththeapplet.Itshould notbeusedunlessyouare constructingyourowncustomapplet viewer.

MethodDescription

StringgetParameter(String

paramname):

Usedtoobtainparameterdata

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