How does the HttpSession interface facilitate session tracking?
- It allows direct manipulation of the HTTP response.
- It enables the creation and management of sessions.
- It is responsible for URL rewriting in session tracking.
- It provides methods to manipulate cookies.
The HttpSession interface in servlets facilitates session tracking by enabling the creation and management of sessions. It provides methods to store, retrieve, and manage session attributes for a particular client.
How does cookie-based session tracking work in servlets?
- Cookies are not used for session tracking in servlets.
- Cookies are used only for authentication in servlets.
- Cookies are used to store session information on the client side.
- Cookies are used to store session information on the server side.
Cookie-based session tracking in servlets involves storing session information on the client side using cookies. This allows the server to recognize and associate subsequent requests with the same session.
What technology is typically used for writing presentation logic in web applications?
- Applet
- JSP
- JavaBean
- Servlet
JavaServer Pages (JSP) is typically used for writing presentation logic in web applications, allowing Java code to be embedded into HTML for dynamic content generation.
If a servlet needs to log application-wide events, which object would be the best choice for retrieving the log file’s path?
- HttpServletRequest
- HttpServletResponse
- ServletConfig
- ServletContext
The ServletContext provides a way to retrieve information that is shared among servlets, making it suitable for obtaining the log file's path for application-wide event logging.
A servlet is loaded at startup, processes several requests, and then is removed from the server. Identify the correct order of method invocations in its lifecycle.
- destroy() -> service() -> init()
- init() -> destroy() -> service()
- init() -> service() -> destroy()
- service() -> init() -> destroy()
The correct order of method invocations in the lifecycle of a servlet is init() (initialization) -> service() (processing requests) -> destroy() (removal from the server).
Which Java method is used to add a cookie to the response object?
- addCookie()
- createCookie()
- insertCookie()
- setCookie()
The addCookie() method is used in Java to add a cookie to the response object and send it to the client.
How does an HTTP servlet handle multipart/form-data requests?
- It accesses the data using request.getParts() method.
- It employs the request.getInputStream() method.
- It uses the HttpServletRequest.getParameter() method.
- It utilizes the MultipartRequest class.
Handling multipart/form-data requests in an HTTP servlet involves using the request.getParts() method to access the various parts of the request, allowing extraction of file uploads and other data.
What happens if a non-existent initialization parameter is requested in a servlet?
- The servlet will automatically create the parameter with a default value.
- The servlet will prompt the user to provide the missing parameter.
- The servlet will receive a null value for the requested parameter.
- The servlet will throw a runtime exception.
If a servlet requests a non-existent initialization parameter, it will receive a null value for the requested parameter. Servlets should handle null values appropriately to avoid unexpected behavior.
In servlets, which method is used to add a cookie to the response headers?
- response.addCookie(Cookie cookie);
- response.createCookie(Cookie cookie);
- response.insertCookie(Cookie cookie);
- response.setCookie(Cookie cookie);
The correct method to add a cookie to the response headers in servlets is response.addCookie(Cookie cookie);.
What is a key difference between automated testing and manual testing?
- Automated testing is faster
- Automated testing requires human intervention
- Manual testing cannot be repeated easily
- Manual testing is more reliable
The key difference is that automated testing is performed with the help of test scripts and tools, while manual testing relies on human testers. Automated testing is efficient but requires setup and maintenance, while manual testing is more adaptable but slower.
How does the choice of Software Architecture Design impact the scalability of a software application?
- It determines the color scheme.
- It doesn't affect scalability.
- It enables the use of new technologies.
- It plays a crucial role in scalability.
Software architecture design significantly impacts scalability. It determines the structure of the software, affecting its ability to handle increased loads and users. A well-designed architecture can support scaling, whereas a poor one may lead to performance issues. Architects make choices related to components, patterns, and technologies to ensure scalability.
How does the use of design principles, such as SOLID, impact the maintainability of software?
- It enhances software maintainability.
- It has no impact on software maintainability.
- It makes software rigid and hard to change.
- It only affects performance.
The use of design principles, such as SOLID (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion), enhances software maintainability by promoting modular, flexible, and easy-to-maintain code.