August 06, 2017
FEATURE
|
APPLICATION
|
APPLET
|
main() method
|
Present
|
Not present
|
Execution
|
Requires JRE
|
Requires a browser like Chrome
|
Nature
|
Called as stand-alone application
as application can be executed from command prompt
|
Requires some third party tool
help like a browser to execute
|
Restrictions
|
Can access any data or software
available on the system
|
cannot access any thing on the
system except browser’s services
|
Security
|
Does not require any security
|
Requires highest security for the
system as they are untrusted
|
Size of Program
|
Large Program
|
Small Program
|
Requirement
|
Need JDK, JRE, JVM installed on
client machine.
|
Applet is portable and can be
executed by any JAVA supported browser.
|
Access
|
Application can access all the
resources of the computer
|
Applet applications are executed
in a Restricted Environment
|
Program Creation
|
Applications are created by
writing public static void main(String[] s) method.
|
Applets are created by extending
the java.applet.Applet
|
Start Point
|
Application has a single start
point which is main method
|
Applet application has 5 methods
which will be automatically invoked on occurance of specific event
|
Program Structure
|
import java.awt.*;
import java.applet.*;
public
class Myclass extends Applet
{
public void init() { }
public void start() { }
public void stop() {}
public void destroy() {}
public void paint(Graphics g) {}
}
|
public class
MyClass
{
public static
void main(String args[]) {}
}
|
Advantages of Applets of Applets Vs Applications
- Execution of applets is easy in a Web browser and does not require any installation or deployment procedure in realtime programming (where as servlets require).
- Writing and displaying (just opening in a browser) graphics and animations is easier than applications.
- In GUI development, constructor, size of frame, window closing code etc. are not required (but are required in applications).
Restrictions of Applets of Applets Vs Applications
- Applets are required separate compilation before opening in a browser.
- In realtime environment, the bytecode of applet is to be downloaded from the server to the client machine.
- Applets are treated as untrusted (as they were developed by unknown people and placed on unknown servers whose trustworthiness is not guaranteed) and for this reason they are not allowed, as a security measure, to access any system resources like file system etc. available on the client system.
- Extra Code is required to communicate between applets using AppletContext.
