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Welcome to our Java Servlet quiz! This blog post presents a set of Multiple Choice Questions (MCQs) to test your knowledge of Java Servlet concepts.
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1. What does a servlet in Java do?
a) Serves static web pages
b) Handles client requests and generates dynamic content
c) Manages database connections
d) Handles email communication
Answer:
b) Handles client requests and generates dynamic content
Explanation:
A servlet in Java is a server-side component that handles client requests and generates dynamic content, typically in the form of HTML pages.
2. Which method is used to initialize a servlet?
a) init()
b) start()
c) initialize()
d) setup()
Answer:
a) init()
Explanation:
The init() method is used to initialize a servlet. It is called by the servlet container when the servlet is first loaded into memory.
3. Which method is used to handle GET requests in a servlet?
a) doPost()
b) doGet()
c) service()
d) handleGet()
Answer:
b) doGet()
Explanation:
The doGet() method is used to handle GET requests in a servlet. It is called by the servlet container when a client makes an HTTP GET request.
4. Which method is used to handle POST requests in a servlet?
a) doPost()
b) doGet()
c) service()
d) handlePost()
Answer:
a) doPost()
Explanation:
The doPost() method is used to handle POST requests in a servlet. It is called by the servlet container when a client makes an HTTP POST request.
5. Which method is called to destroy a servlet?
a) destroy()
b) stop()
c) finalize()
d) dispose()
Answer:
a) destroy()
Explanation:
The destroy() method is called by the servlet container to destroy a servlet. This method gives the servlet an opportunity to clean up resources before it is removed from memory.
6. Which of the following methods is used to read form data sent via a POST request in a servlet?
a) getRequestData()
b) getFormData()
c) getParameter()
d) getPostData()
Answer:
c) getParameter()
Explanation:
The getParameter() method is used to read form data sent via a POST request in a servlet. It retrieves the value of a request parameter as a String.
7. What is the use of the HttpServletResponse's sendRedirect() method?
a) To forward the request to another resource within the same application
b) To redirect the client to another URL
c) To send an error response to the client
d) To include the content of another resource in the response
Answer:
b) To redirect the client to another URL
Explanation:
The sendRedirect() method is used to redirect the client to another URL. It sends an HTTP response to the client with a status code of 302 (Found) and the new URL.
8. Which of the following is NOT a valid HTTP method that can be handled by a servlet?
a) GET
b) POST
c) DELETE
d) FETCH
Answer:
d) FETCH
Explanation:
FETCH is not a valid HTTP method. The valid HTTP methods include GET, POST, PUT, DELETE, OPTIONS, and HEAD.
9. How can a servlet share data between requests for the same user?
a) Using instance variables
b) Using cookies
c) Using request attributes
d) Using servlet context
Answer:
b) Using cookies
Explanation:
A servlet can share data between requests for the same user using cookies. Cookies store data on the client-side and are sent with each request.
10. What is the default scope of a servlet attribute?
a) Request
b) Session
c) Application
d) Page
Answer:
a) Request
Explanation:
The default scope of a servlet attribute is request scope, meaning the attribute is available only for the current request
11. Which interface provides the methods to access servlet context information?
a) ServletConfig
b) ServletRequest
c) ServletContext
d) HttpServletRequest
Answer:
c) ServletContext
Explanation:
The ServletContext interface provides methods to access context information and share data across the entire web application.
12. How does a servlet filter work?
a) It filters the incoming HTTP request before it reaches the servlet
b) It filters the outgoing HTTP response after it leaves the servlet
c) It can filter both the request and response
d) It intercepts HTTP methods
Answer:
c) It can filter both the request and response
Explanation:
A servlet filter can intercept both the incoming request and outgoing response, allowing pre-processing and post-processing of HTTP requests and responses.
13. Which of the following is NOT a valid servlet lifecycle method?
a) init()
b) service()
c) start()
d) destroy()
Answer:
c) start()
Explanation:
The start() method is not a valid servlet lifecycle method. The correct lifecycle methods are init(), service(), and destroy().
14. What is the purpose of the RequestDispatcher's forward() method?
a) To redirect the client to a new URL
b) To forward a request from one servlet to another within the same server
c) To send an error response to the client
d) To send a response back to the client
Answer:
b) To forward a request from one servlet to another within the same server
Explanation:
The forward() method of the RequestDispatcher is used to forward a request from one servlet to another resource within the same server.
15. What is the purpose of the session.invalidate() method in a servlet?
a) To refresh the current session
b) To reset the session attributes
c) To invalidate and terminate the current session
d) To extend the session timeout
Answer:
c) To invalidate and terminate the current session
Explanation:
The session.invalidate() method is used to invalidate and terminate the current session, clearing all associated session data.
16. Which of the following is NOT a method of the HttpServletRequest interface?
a) getSession()
b) getCookies()
c) getOutputStream()
d) getParameter()
Answer:
c) getOutputStream()
Explanation:
The getOutputStream() method is not part of the HttpServletRequest interface. It is a method of the HttpServletResponse interface.
17. Which of the following statements is true about servlet context?
a) Servlet context is specific to each servlet
b) Servlet context is shared across the entire web application
c) Servlet context is created per user session
d) Servlet context is created per request
Answer:
b) Servlet context is shared across the entire web application
Explanation:
The servlet context is shared across the entire web application and allows servlets to communicate and share data.
18. Which of the following is used to send binary data to the client in a servlet?
a) PrintWriter
b) DataOutputStream
c) ServletOutputStream
d) ObjectOutputStream
Answer:
c) ServletOutputStream
Explanation:
The ServletOutputStream is used to send binary data, such as images or files, to the client in a servlet.
19. What is the default timeout period for an HTTP session in a servlet?
a) 15 minutes
b) 30 minutes
c) 60 minutes
d) No timeout
Answer:
b) 30 minutes
Explanation:
The default timeout period for an HTTP session in a servlet is 30 minutes.
20. Which method is used to set a session attribute in a servlet?
a) setAttribute()
b) putAttribute()
c) addAttribute()
d) storeAttribute()
Answer:
a) setAttribute()
Explanation:
The setAttribute() method is used to set a session attribute in a servlet, allowing data to be stored in the session.
21. Which method is used to read the body of an HTTP request in a servlet?
a) getInputStream()
b) getBody()
c) readRequestBody()
d) readInputStream()
Answer:
a) getInputStream()
Explanation:
The getInputStream() method of the HttpServletRequest interface is used to read the body of an HTTP request, particularly when the request contains binary data.
22. Which of the following is used to pass initialization parameters to a servlet?
a) ServletConfig
b) ServletContext
c) HttpServletRequest
d) HttpSession
Answer:
a) ServletConfig
Explanation:
The ServletConfig interface is used to pass initialization parameters to a servlet. These parameters are defined in the web.xml file.
23. What does the term "idempotent" refer to in the context of HTTP methods?
a) A method that changes server state
b) A method that can be safely repeated without changing the outcome
c) A method that requires user authentication
d) A method that always returns the same status code
Answer:
b) A method that can be safely repeated without changing the outcome
Explanation:
An idempotent HTTP method, like GET or PUT, can be safely repeated multiple times without changing the outcome or server state.
24. What is the purpose of the @WebServlet annotation in a servlet?
a) To specify the servlet's URL mapping
b) To define the servlet's lifecycle methods
c) To specify the servlet's initialization parameters
d) To configure servlet filters
Answer:
a) To specify the servlet's URL mapping
Explanation:
The @WebServlet annotation is used to specify the URL pattern to which the servlet responds, eliminating the need to define the mapping in the web.xml file.
25. Which HTTP status code is sent when a servlet cannot find the requested resource?
a) 404 Not Found
b) 500 Internal Server Error
c) 403 Forbidden
d) 401 Unauthorized
Answer:
a) 404 Not Found
Explanation:
The 404 Not Found status code is sent by the servlet when the requested resource cannot be found on the server.
26. What is the primary role of a servlet filter?
a) To handle client requests directly
b) To transform the request and response objects
c) To generate dynamic content
d) To establish database connections
Answer:
b) To transform the request and response objects
Explanation:
The primary role of a servlet filter is to intercept and transform request and response objects before they reach the servlet or after the servlet processes them.
27. Which method is used to retrieve an array of cookies in a servlet?
a) getCookies()
b) getCookieArray()
c) getAllCookies()
d) retrieveCookies()
Answer:
a) getCookies()
Explanation:
The getCookies() method of the HttpServletRequest interface is used to retrieve an array of cookies sent by the client in a servlet.
Conclusion
We hope you enjoyed our Java Servlet quiz! Assessing your knowledge through multiple choice questions helps reinforce your understanding of servlet concepts.
Learn and Master Java Programming: Learn Java Programming with Examples
Check out 100+ quiz questions: 100+ Quiz Questions to Test Your Java, Spring Boot, Microservices, Hibernate, REST API Skills
Keep exploring and practicing Java servlets to further enhance your skills in web development.
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