Wednesday, 4 February 2015

26 TOP Java Applet Interview Questions and Answers

1. What type of sound file formats can I use for the applets?
Java v1.02 only supports the "voice format" of the .au sound files. This is also know as "?-law, 8/16-bit, mono, 8000hz sample rate"

2. Why do you Canvas?
The Canvas class of java.awt is used to provide custom drawing and event handling. It provides a general GUI component for drawing images and text on the screen. It does not support any drawing methods of its own, but provides access to a Graphics object through its paint() method. The paint() method is invoked upon the creation and update of a canvas so that the Graphics object associated with a Canvas object can be updated.

3. What is Difference between AWT and Swing?
Swing provides a richer set of components than AWT. They are 100% Java-based. AWT on the other hand was developed with the mind set that if a component or capability of a component werent available on one platform, it wouldnt be available on any platform. Due to the peer-based nature of AWT, what might work on one implementation might not work on another, as the peer-integration might not be as robust. There are a few other advantages to Swing over AWT:
? Swing provides both additional components and added functionality to AWT-replacement components
? Swing components can change their appearance based on the current "look and feel" library that's being used.
? Swing components follow the Model-View-Controller (MVC) paradigm, and thus can provide a much more flexible UI.
? Swing provides "extras" for components, such as:
? Icons on many components
? Decorative borders for components
? Tool tips for components
? Swing components are lightweight (less resource intensive than AWT)
? Swing provides built-in double buffering
? Swing provides paint debugging support for when you build your own components

Swing also has a few disadvantages:
? It requires Java 2 or a separate JAR file
? If you're not very careful when programming, it can be slower than AWT (all components are drawn)
? Swing components that look like native components might not act exactly like native components

4. What is the base class for all swing components?
JComponent (except top-level containers)

5. How do you communicate in between Applets and Servlets?
We can use the java.net.URLConnection and java.net.URL classes to open a standard HTTP connection and "tunnel" to the web server. The server then passes this information to the servlet in the normal way. Basically, the applet pretends to be a web browser, and the servlet doesn't know the difference. As far as the servlet is concerned, the applet is just another HTTP client.
More Questions & Answers :-
Part1  Part2  Part3  Part4  Part5

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