Java Applets

 

 

           Java Applets 

Applets  :-    

             An  applets  is a  Java program that  runs in a Web browser.  An applet can  be a  fully  functional  Java  application because  it has the entire Java API at  its disposal. There are some  important  differences between  an applet and  a standalone Java application, including the following :

1.  An  applet is a Java class  that  extends the java.applet.Applet class.

2.   A main ( ) method  is not  invoked  on an  applet ,  and  an applet class will not  define main( ).

3.  Applets are  designed  to be  embedded within  an HTML page.

4.   When  a user  view  an HTML  page  that  contains an  applet ,  the code for the  applet is downloaded  o the  user's machine.

5.  A   JVM    is required to  view an  applet .  The JVM  can be  either a plug- in  of  the Web  browser or  a separate runtime  environment.

6.  The  JVM   on the user's  machine  creates  an  instance of the  applet class and  invokes  various  methods  during  the  applet's lifetime.

7.  Applets  have  strict security rules that  are  enforced  by  the Web browser .  The  security  of  an  applet is often referred  to as  sandbox  security , comparing the  applet to  a child  playing  in a sandbox with  various rules  that  must be followed.

8.  Other  classes  that  the  applet  needs can be downloaded  in a single Java Archive (JAR) file.

9.  Applets are  the small  programs while  applications  are  larger programs.

10.  Applets  are designed  just for  handling the client site  problems , while  the Java  applications are  designed  to work  with the client as well as server.

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