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Technical Java Sample Questions : Java Applet Sample Questions

There is a difference between java applet questions and java database sample questions. Also, the core java sample questions are different from both of these. Here we have provided here technical java applet sample questions for the reference of the student.

1. What is an Applet? Should applets have constructors?

   Answer: Applets are small programs transferred through Internet, are automatically installed and run as a part of the 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 the browser or through Appletviewer utility provided by JDK.

2. What are the Applet's Life Cycle methods? Explain them?

   Answer: Following are methods in the life cycle of an Applet:

   • init() method: It is called when the applet is first loaded. This method is called only once in the entire cycle of the applet. This method usually intializes the variables to be used in the applet.
   • start( ) method: It is called each time the applet is started.
   • paint() method: It is called when the applet is minimized or refreshed.

   This method is also used for drawing different strings, figures, and images on the applet window.

   • stop( ) method: It is called when the browser moves off the applet's page.
   • destroy( ) method: It is called when the browser is finished with the applet.

3. What is the sequence for calling the methods by AWT for applets?

   Answer: When an applet begins, the AWT calls the following methods, in this sequence:

   • init()
   • start()
   • paint()
   When an applet is terminated, the following sequence of method calls takes place:
   • stop()
   • destroy()

We hope that the sample questions provided above were of some help to you. You can also refer to the J2EE Sample Questions for further help.