Tag: programming languages

Questions Related to programming languages

  1. &complex_num();
  2. complex_num();

which is correct?
technology programming languages

  1. 1 can only be called with predecleration of complex_num

  2. 1 and 2 are same

  3. 2 can only be called with predecleration of complex_num

  4. 1 is reference to a subroutine

Show answer
Correct Option: C

Can we use the constructor, instead of init(), to initialize servlet?
technology programming languages

  1. Yes

  2. No

  3. May Be

  4. Can't Say

Show answer
Correct Option: A

Which of the following should NOT be used to share data between servlets in a distributed web application?
technology programming languages

  1. Attributes of ServletContext

  2. Enterprise Java Beans

  3. Attributes of HttpSession

  4. Database

Show answer
Correct Option: A

Can we call destroy() method on servlets from service method ?
technology programming languages

  1. Yes

  2. No

  3. May be

  4. Cant Say

Show answer
Correct Option: A

Which jsp implicit object is synchronized?
technology programming languages

  1. session

  2. page

  3. application

  4. None of the above

Show answer
Correct Option: B

Can we implement an interface in JSP ?
technology programming languages

  1. Yes

  2. No

  3. May be

  4. Cant say

Show answer
Correct Option: B

Which of the following aren't the methods for state/session management in the context of Servlets?
technology programming languages

  1. Http Redirects

  2. Hidden Variables

  3. Cookies

  4. Rewritten URLs

  5. Using HttpSession Interface

Show answer
Correct Option: A

The variables local to the methods like service(), doPost() and doGet() are thread safe. True/False?
technology programming languages

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

To solve this question, the user needs to know the basic concept of thread safety in Java and how it applies to local variables in methods like service(), doPost() and doGet().

The answer to this question is:

A. True

Explanation:

Local variables declared within a method are thread-safe because they are confined to the method and are not shared between threads. Each thread, when executing the method, will have its own copy of the local variables declared within the method. As a result, other threads cannot modify the values of these local variables, ensuring thread safety.

Therefore, the correct answer is option A, true.

You want to use URL rewriting to support client browsers, which do not use cookies. Which method will you use to attach the session id to a URL that is to be used for the sendRedirect() method of the HttpServletResponse?
technology programming languages

  1. encodeURL

  2. encodeRedirectURL

  3. encodeSessionURL

  4. encodeSessionRedirectURL

  5. None of these

Show answer
Correct Option: B

Which one of the following ServletRequest interface method returns more than one value associated with parameter?

technology programming languages

  1. getParameterValue()

  2. getParameters()

  3. getParamValues()

  4. getParameterValues()

Show answer
Correct Option: D

AI Explanation

To answer this question, we need to understand the difference between the methods getParameterValue() and getParameterValues() in the ServletRequest interface.

Option A) getParameterValue() - This option is incorrect because the getParameterValue() method returns a single value associated with a parameter. It does not return multiple values.

Option B) getParameters() - This option is incorrect because the getParameters() method returns a Map object containing all parameter names and their corresponding values. It does not specifically return multiple values associated with a single parameter.

Option C) getParamValues() - This option is incorrect because the getParamValues() method does not exist in the ServletRequest interface.

Option D) getParameterValues() - This option is correct because the getParameterValues() method returns an array of String objects containing all values associated with a parameter. If multiple values are associated with a parameter, this method allows you to retrieve all of them.

Therefore, the correct answer is option D. The getParameterValues() method returns more than one value associated with a parameter.