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Java Applet Interview Questions and Answers

Ques 1. What is an applet?

Applet is a program which can get downloaded into a client environment and start executing there.

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Ques 2. What is an Applet? Should applets have constructors?

  • 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 3. How will you initialize an Applet?

Write my initialization code in the applets init method or applet constructor.

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Ques 4. How to insert your applets into FrontPage?

1. Place the .class file in the directory containing the HTML document into which you want to insert the applet.
2. Copy the ... tag from your applet implementation or examples to the clipboard.
3. In FrontPage select the "HTML" tab from the lower left hand corner.
4. Paste the <applet>...</applet> tag in an appropriate place between the <body> and </body> tags. You'll find a gray box with the aqua letter "J" in the "Normal" view indicating the the applet tag has been inserted. 
5. To see the applet appearance select the "Preview" tab.

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Ques 5. What is the order of method invocation in an Applet?

  • public void init() : Initialization method called once by browser.
  • public void start() : Method called after init() and contains code to start processing. If the user leaves the page and returns without killing the current browser session, the start () method is called without being preceded by init ().
  • public void stop() : Stops all processing started by start (). Done if user moves off page.
  • public void destroy() : Called if current browser session is being terminated. Frees all resources used by applet.

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