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Freshers / Beginner level questions & 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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Ques 6. What are the Applets Life Cycle methods? Explain them?

methods in the life cycle of an Applet: 

  • init( ) method - called when an applet is first loaded. This method is called only once in the entire cycle of an applet. This method usually intialize the variables to be used in the applet.
  • start( ) method - called each time an applet is started.
  • paint( ) method - called when the applet is minimized or refreshed. This method is used for drawing different strings, figures, and images on the applet window.
  • stop( ) method - called when the browser moves off the applet's page.
  • destroy( ) method - called when the browser is finished with the applet.

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Ques 7. What is the sequence for calling the methods by AWT for applets?

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

  1. init()
  2. start()
  3. paint() 

When an applet is terminated, the following sequence of method calls takes place:

  1. stop()
  2. destroy()

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Ques 8. How do Applets differ from Applications?

Following are the main differences:

Application: Stand Alone, doesn't need web-browser.

Applet: Needs no explicit installation on local machine. Can be transferred through Internet on to the local machine and may run as part of web-browser.

Application: Execution starts with main() method. Doesn't work if main is not there.

Applet: Execution starts with init() method.

Application: May or may not be a GUI.

Applet: Must run within a GUI (Using AWT). This is essential feature of applets.

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Ques 9. Can we pass parameters to an applet from HTML page to an applet? How?

We can pass parameters to an applet usingtag in the following way:

  • <param name="param1″ value="value1″>
  • <param name="param2″ value="value2″>

Access those parameters inside the applet is done by calling getParameter() method inside the applet. Note that getParameter() method returns String value corresponding to the parameter name.

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Ques 10. In our URLs and in the text of the buttons we have comma. Its causing an error. Is there a way to change the delimiting character for the menu arguments?

Since 2.00 version our applets support an user-defined delimiter for the menu arguments. To modify the default delimiter add the following parameter (you can use any character as a delimiter):

<param name="delimiter" value="~"> and use it within "menuItems":

<param name="menuItems" value=" {Home~http://www.withoutbook.com/index.php} {Features, Setup~http://www.globalguideline.com/} ">

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Ques 11. What is the difference between an Applet and an Application?

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 12. How will you establish the connection between the servlet and an applet?

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 13. How do we read number information from my applets parameters, given that Applets getParameter() method returns a string?

Use the parseInt() method in the Integer Class, the Float(String) constructor or parseFloat() method in the Class Float, or the

Double(String) constructor or parseDoulbl() method in the class Double.

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Ques 14. How can I arrange for different applets on a web page to communicate with each other?

Name your applets inside the Applet tag and invoke AppletContext's getApplet() method in your applet code to obtain references to the other applets on the page.

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Ques 15. Can applets on different pages communicate with each other?

Use the getSize() method, which the Applet class inherits from the Component class in the Java.awt package. The getSize() method returns the size of the applet as a Dimension object, from which you extract separate width, height fields. The following code snippet explains this:

Dimension dim = getSize();
int appletwidth = dim.width();
int appletheight = dim.height();

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Ques 16. Which classes and interfaces does Applet class consist?

Applet class consists of a single class, the Applet class and three interfaces: AppletContext, AppletStub, and AudioClip.

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Ques 17. What is AppletStub Interface?

The applet stub interface provides the means by which an applet and the browser communicate. Your code will not typically implement this interface.

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Ques 18. What tags are mandatory when creating HTML to display an applet?

code, height, width.

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Ques 19. What are the Applets information methods?

The following are the Applet's information methods: getAppletInfo() method: Returns a string describing the applet, its author, copyright information, etc. getParameterInfo( ) method: Returns an array of string describing the applet's parameters.

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Ques 20. What are the steps involved in Applet development?

Following are the steps involved in Applet development:

► Create/Edit a Java source file. This file must contain a class which extends Applet class.
► Compile your program using javac
► Execute the appletviewer, specifying the name of your applet's source file or html file. In case the applet information is stored in html file then Applet can be invoked using java enabled web browser.

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Ques 21. Which method is used to output a string to an applet? Which function is this method included in?

drawString( ) method is used to output a string to an applet. This method is included in the paint method of the Applet.

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Ques 22. When is update method called?

Whenever a screen needs redrawing (e.g., upon creation, resizing, validating) the update method is called. By default, the update method clears the screen and then calls the paint method, which normally contains all the drawing code.

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Ques 23. How will you communicate between two Applets?

The simplest method is to use the static variables of a shared class since there's only one instance of the class and hence only one copy of its static variables. A slightly more reliable method relies on the fact that all the applets on a given page share the same AppletContext. We obtain this applet context as follows:

AppletContext ac = getAppletContext();

AppletContext provides applets with methods such as getApplet(name), getApplets(),getAudioClip, getImage, showDocument and showStatus().

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Ques 24. 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.

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Ques 25. What is the base class for all swing components?

JComponent (except top-level containers)

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Ques 26. 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.

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Ques 27. 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.

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Ques 28. 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"

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