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Java Applet Interview Questions and Answers

Ques 1. What is the difference between an Applet and an Application?

Ans. A Java application is made up of a main() method declared as public static void that accepts a string array argument, along with any other classes that main() calls. It lives in the environment that the host OS provides. A Java applet is made up of at least one public class that has to be subclassed from java.awt.Applet. The applet is confined to living in the user's Web browser, and the browser's security rules, (or Sun's appletviewer, which has fewer restrictions).  The differences between an applet and an application are as follows:
1. Applets can be embedded in HTML pages and downloaded over the Internet whereas Applications have no special support in HTML for embedding or downloading.
2. Applets can only be executed inside a java compatible container, such as a browser or appletviewer whereas Applications are executed at command line by java.exe or jview.exe.
3. Applets execute under strict security limitations that disallow certain operations(sandbox model security) whereas Applications have no inherent security restrictions.
4. Applets don't have the main() method as in applications. Instead they operate on an entirely different mechanism where they are initialized by init(),started by start(),stopped by stop() or destroyed by destroy().

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Ques 2. What is an applet?
Ans. Applet is a program which can get downloaded into a client environment and start executing there.
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Ques 3. How will you establish the connection between the servlet and an applet?
Ans. Using the URL, I will create the connection URL. Then by openConnection method of the URL, I will establish the connection, through which I can be able to exchange data.
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Ques 4. What is an Applet? Should applets have constructors?
Ans. Applets are small programs transferred through Internet, automatically installed and run as part of web-browser. Applets implements functionality of a client. Applet is a dynamic and interactive program that runs inside a Web page displayed by a Java-capable browser. We don't have the concept of Constructors in Applets. Applets can be invoked either through browser or through Appletviewer utility provided by JDK.
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Ques 5. How will you initialize an Applet?
Ans. Write my initialization code in the applets init method or applet constructor.
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