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Java Applet Interview Questions and Answers

Ques 26. What is the base class for all swing components?

Ans. JComponent (except top-level containers)

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Ques 27. What is Difference between AWT and Swing?
Ans. 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.
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Ques 28. Why do you Canvas?
Ans. 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.
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Ques 29. What type of sound file formats can I use for the applets?
Ans. 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"
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