What is an Applet in Java ?
An Applet is a small java program that runs in a Java enabled web browser. Java Applet is a small piece of java code that is embedded into HTML page, which gets executed when the HTML page loads into the browser.Applets provide powerful client-side functionality. As applets are loaded from remote machines and executed on client-side, there are various security restrictions on applets. Let us look into various Applets advantages and Applets Restrictions in brief :
Applets have many advantages over stand-alone application. Some of them are :
- As applet is a small java program, so it is platform independent code which is capable to run on any browser.
- Applets can perform various small tasks on client-side machines. They can play sounds, show images, get user inputs, get mouse clicks and even get user keystrokes, etc ...
- Applets creates and edit graphics on client-side which are different and independent of client-side platform.
- As compared to stand-alone application applets are small in size, the advantage of transferring it over network makes it more usable.
- Applets run on client browser so they provide functionality to import resources such as images, audio clips based on Url's.
- Applets are quite secure because of their access to resources.
- Applets are secure and safe to use because they cannot perform any modifications over local system.
- Various small tasks such as performing login, inventory checking, task scheduling can be done by applets running over Intranets.
Applets have many restrictions over
- If we are running an applet from a provider who is not trustworthy than security is important.
- Applet itself cannot run or modify any application on the local system.
- Applets has no access to client-side resources such as files , OS etc.
- Applets can have special privileges. They have to be tagged as trusted applets and they must be registered to APS (Applet Security Manager).
- Applet has little restriction when it comes to communication. It can communicate only with the machine from which it was loaded.
- Applet cannot work with native methods.
- Applet can only extract information about client-machine is its name, java version, OS, version etc ... .
- Applets tend to be slow on execution because all the classes and resources which it needs have to be transported over the network.
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