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 applet1.2 Designing a web page:
yApplet tag yAdding applet to HTML file yRunning the applet yPassing parameter to applet11CONCEPTOFAPPLETPROGRAMMING
|Java supports two types of programming :1) Application program:
applicationisaprogramthatrunsonComputer.
2)Appletprogram:
Anappletisanapplicationdesignedtobe
transmittedovertheInternetandexecutedbyaJava-compatibleWebbrowser.
APPLET
appletviewerorjavacompatiblewebbrowser. |JavaappletisajavaclassthatyouembedinanHTMLpageandisdownloadedandexecutedbya
webbrowser. |AppletŃMQ·Pbeexecuteddirectly. it.APPLET
|Wecanembedappletsintowebpagesintwoways: webpages. systemandthenembeditintoawebpage.LOADINGORDISPLAYINGAPPLET
Java Byte code
Web page html
VMApplet
Browser
orApplet viewer
LOCALAPPLET
isknownaslocalapplet. andlocatesandloadsthespecifiedapplet. webpages.LOCALAPPLET
Local applet
Local computer
REMOTEAPPLET
isknownasremoteApplet. downloadtheremoteappletontooursystemviaInternetandthenrunit.
|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. becauseofsecurityconcernsWHENTOUSEAPPLET?
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,AppletStubandAudioclip.
lessconstructor,whichisnotusedgenerally. constructed.APPLETCLASS
java.awt.panel. |Java.appletissmallestpackageinJavaAPI. interfaces:AppletContext,AppletStubandAudioclip.
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 stoppedMethodDescription
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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