Question 1

Which of these method of DatagramPacket is used to find the length of byte array?
A)getnumber()
B)length()
C)length().
D)getlength()

Accepted Answer

The correct method to find the length of the byte array in a DatagramPacket is getLength(). This method returns the length of the data in the packet.

Question 2

Which of these method is used to start a server thread?
A)run()
B)start()
C)runthread()
D)startthread()

Accepted Answer

A

Question 3

Which of these method is called when http daemon is acting like a normal web server?
A)handle()
B)handleget()
C)handleget().
D)handleget(),

Accepted Answer

handleget() is called when the http daemon is acting like a normal web server.

Question 4

Which of these methods of httpd class is used to read data from the stream?
A)getdta()
B)getresponse()
C)getstream()
D)getrawrequest()

Accepted Answer

The answer of Which of these methods of httpd class...

Question 5

Which of these method of httpd class is used to get report on each hit to HTTP server?
A)log()
B)logentry()
C)loghttpd()
D)logresponse()

Accepted Answer

The correct method used to get a report on each hit to an HTTP server in the context of the httpd class is logentry(). This method is specifically designed to log each request or "hit" the server receives, allowing for monitoring and analysis of server traffic.

Question 6

Which of these method is used to find a URL from the cache of httpd?
A)findfromcache()
B)findfromcache().
C)servefromcache()
D)getfromcache()

Accepted Answer

The correct method used to find a URL from the cache of httpd is `servefromcache()`. This method is designed to retrieve and serve content that has been previously stored in the cache, optimizing the server's performance by reducing the need to fetch the same content repeatedly from the original source.

Question 7

Which of these variables stores the number of hits that are successfully served out of cache?
A)hits
B)hitstocache
C)hits_to_cache
D)hits.to.cache

Accepted Answer

The answer of Which of these variables stores the number...

Question 8

Which of these method of httpd class is used to write UrlCacheEntry object into local disk?
A)writediskcache()
B)writetodisk()
C)writecache()
D)writediskentry()

Accepted Answer

The method `writediskcache()` is used to write UrlCacheEntry objects to the local disk in the httpd class.

Question 9

Which of these is an instance variable of class httpd?
A)port
B)cache
C)log
D)all of the mentioned

Accepted Answer

Instance variables are variables for which each instantiated object of the class has a separate copy, or instance. In the context of an httpd (HTTP Daemon) class, port, cache, and log can all be instance variables. The port would be used to specify the listening port for HTTP requests, the cache could be used to store cached data to improve performance, and the log could be an instance variable used to log requests, errors, or other information. Therefore, all of the mentioned options are plausible instance variables for an httpd class.

Question 10

Which of these is an instance variable of httpd that is a Hashtable?
A)port
B)cache
C)log
D)stopflag

Accepted Answer

The answer of Which of these is an instance variable...

Question 11

Which of these exception is thrown by URL class's constructors?
A)urlnotfound
B)urlsourcenotfound
C)malformedurlexception
D)urlnotfoundexception

Accepted Answer

The URL class's constructors throw a MalformedURLException if the input string specifies an unknown protocol or if the string could not be parsed. This is a checked exception that must be caught or declared to be thrown.

Question 12

Which of these methods is used to know host of an URL?
A)host()
B)gethost()
C)gethost().
D)gethost(),

Accepted Answer

The answer of Which of these methods is used to...

Question 13

Which of these methods is used to know the full URL of an URL object?
A)fullhost()
B)gethost()
C)externalform()
D)toexternalform()

Accepted Answer

The method `toExternalForm()` is used to get the full URL of a URL object in Java.

Question 14

Which of these class is used to access actual bits or content information of a URL?
A)url
B)urldecoder
C)urlconnection
D)all of the mentioned

Accepted Answer

All of the mentioned classes are used to access actual bits or content information of a URL.

Question 15

Which object of HttpSession can be used to view and manipulate information about a session?
A)session identifier
B)creation time
C)last accessed time
D)all mentioned above

Accepted Answer

The HttpSession object provides methods to access the session identifier, creation time, and last accessed time, allowing manipulation and viewing of session information.

Question 16

Which of these ways used to communicate from an applet to servlet?
A)rmi communication
B)http communication
C)socket communication
D)all mentioned above

Accepted Answer

Applets can communicate with servlets using RMI (Remote Method Invocation), HTTP (Hypertext Transfer Protocol), and socket communication. Each of these methods provides a different way to establish communication between the client-side applet and the server-side servlet, making all the mentioned options correct.

Question 17

Which methods are used to bind the objects on HttpSession instance andget the objects?
A)setattribute
B)getattribute
C)both a & b
D)none of the above

Accepted Answer

To interact with objects in an HttpSession, the methods used are setAttribute(String name, Object value) to bind objects to the session and getAttribute(String name) to retrieve objects from the session.

Question 18

Which type of ServletEngine is a server that includes built-in support for servlets?
A)add-on servletengine
B)embedded servletengine
C)standalone servletengine
D)none of the above

Accepted Answer

The answer of Which type of ServletEngine is a server...

Question 19

What type of servlets use these methods doGet(), doPost(),doHead, doDelete(), doTrace()?
A)genereic servlets
B)httpservlets
C)all of the above
D)none of the above

Accepted Answer

These methods (doGet(), doPost(), doHead(), doDelete(), doTrace()) are specifically associated with HttpServlets, which are designed to handle HTTP requests and responses. GenericServlet is a protocol-independent servlet, and these HTTP-specific methods are not part of it.

Question 20

Which cookie it is valid for single session only and it is removed each time when the user closes the browser?
A)persistent cookie
B)non-persistent cookie
C)all the above
D)none of the above

Accepted Answer

Non-persistent cookies, also known as session cookies, are valid only for a single session and are removed each time the user closes the browser.

Quiz 8: Java Web Development: Methods, Variables, and Technologies

Which of these method of DatagramPacket is used to find the length of byte array?

Which of these method is used to start a server thread?

Which of these method is called when http daemon is acting like a normal web server?

Which of these methods of httpd class is used to read data from the stream?

Which of these method of httpd class is used to get report on each hit to HTTP server?

Which of these method is used to find a URL from the cache of httpd?

Which of these variables stores the number of hits that are successfully served out of cache?

Which of these method of httpd class is used to write UrlCacheEntry object into local disk?

Which of these is an instance variable of class httpd?

Which of these is an instance variable of httpd that is a Hashtable?

Which of these exception is thrown by URL class's constructors?

Which of these methods is used to know host of an URL?

Which of these methods is used to know the full URL of an URL object?

Which of these class is used to access actual bits or content information of a URL?

Which object of HttpSession can be used to view and manipulate information about a session?

Which of these ways used to communicate from an applet to servlet?

Which methods are used to bind the objects on HttpSession instance andget the objects?

Which type of ServletEngine is a server that includes built-in support for servlets?

What type of servlets use these methods doGet() , doPost() ,doHead, doDelete() , doTrace() ?

Which cookie it is valid for single session only and it is removed each time when the user closes the browser?