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VIDYA BHARTI EDUCATIONAL INSTITUTIONS
APPLET PROGRAMMING IN JAVA
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CONTENTSIntroduction to AppletHierarchy of AppletApplet vs Application programming
Applet Life CycleApplet ExécutionMeritsDemeritsConclusion
INTRODUCTION TO APPLETSApplets are Small java programs used in internet programing.
Applets are associated with a Web page.
Applets are executed in a web browser.
It produces graphical user interface and graphical effects.
APPLET PROGRAMMINGApplets can be embedded in HTML pages and downloaded over the Internet .
Applets can only be executed inside a java compatible container, such as a browser or applet viewer .
Applets execute under strict security limitations that disallow certain operations .
Applet starts execution after init() method .
APPLET VS APPLICATION PROGRAMMING
HIERARCHY OF APPLET
Object
Component
Container
Panel
Applet
jApplet
APPLET LIFE CYCLEBorn
Running Idle
Dead
Begin Initialization
Stopped
Destroyed End
Display
Exit of Browser
stop()
start()paint()
start()
destroy()
init()
Running
APPLET EXECUTIONApplet can be executed in: output:
HTML file
Standard tool ‘AppletViewer’
MERITS Applets are portable, independent of
environment and browser .Java is safe, Applet environment is
secure. Applets loaded when needed, no
need to install or manage them .It is supported by most web browsers. Since Applets are cached in most of
the web browser, it is quickly loaded.
DEMERITSJava plug-in is required to run
applet. Java applet requires JVM so first
time it takes significant startup time.
If applet is not already cached in the machine, it will be downloaded from internet and will take time.
It is difficult to design and build good user interface in applets compared to HTML technology.
CONCLUSIONJava applets are supported by all
the web browsers.
Java applet are much safer in practice compared to code written in traditional languages.
Applet can be used to provide user interface and a variety of graphical effect for web pages. Also provide security features that protect users.
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