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Why does JComponent have add() and remove() methods but Component does not?
JSP Interview Questions and Answers
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21. Why does JComponent have add() and remove() methods but Component does not?
because JComponent is a subclass of Container, and can contain other components and jcomponents.
How can I implement a thread-safe JSP page? - You can make your JSPs thread-safe by having them implement the SingleThreadModel interface. This is done by adding the directive <%@ page isThreadSafe="false" % > within your JSP page.
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Other Interview Questions
- What is a JSP and what is it used for?
- What is difference between custom JSP tags and beans?
- What are the two kinds of comments in JSP and what's the difference between them.
- What is JSP technology?
- What is JSP page?
- What are the implicit objects?
- How many JSP scripting elements and what are they?
- Why are JSP pages the preferred API for creating a web-based client program?
- Is JSP technology extensible?
- Can we use the constructor, instead of init(), to initialize servlet?
- How can a servlet refresh automatically if some new data has entered the database?
- The code in a finally clause will never fail to execute, right?
- How many messaging models do JMS provide for and what are they?
- What information is needed to create a TCP Socket?
- What Class.forName will do while loading drivers?
- How to Retrieve Warnings?
- How many JSP scripting elements are there and what are they?
- In the Servlet 2.4 specification SingleThreadModel has been deprecated, why?
- What are stored procedures? How is it useful?
- How do I include static files within a JSP page?
- Why does JComponent have add() and remove() methods but Component does not?
- How can I enable session tracking for JSP pages if the browser has disabled cookies?
- How do I prevent the output of my JSP or Servlet pages from being cached by the browser?
- How do you restrict page errors display in the JSP page?
- What JSP lifecycle methods can I override?
- How do I perform browser redirection from a JSP page?
- How does JSP handle run-time exceptions?
- How do I use comments within a JSP page?
- Is it possible to share an HttpSession between a JSP and EJB? What happens when I change a value in the HttpSession from inside an EJB?
- How can I implement a thread-safe JSP page?
- How can I declare methods within my JSP page?
- Can I stop JSP execution while in the midst of processing a request?
- Can a JSP page process HTML FORM data?
- Is there a way to reference the "this" variable within a JSP page?
- How do you pass control from one JSP page to another?
- Is there a way I can set the inactivity lease period on a per-session basis?
- How does a servlet communicate with a JSP page?
- How do I include static files within a JSP page?
- Can you make use of a ServletOutputStream object from within a JSP page?
- Can a JSP page instantiate a serialized bean?
- What is JSP?
- How do I mix JSP and SSI #include?
- How do I mix JSP and SSI #include? What is the difference between include directive & jsp:include action?
- How do you prevent the Creation of a Session in a JSP Page and why? What is the difference between include directive & jsp:include action?
- How do I use a scriptlet to initialize a newly instantiated bean?
- How can I set a cookie and delete a cookie from within a JSP page?
- How do you connect to the database from JSP?
- What is the page directive is used to prevent a JSP page from automatically creating a session?
- How do you delete a Cookie within a JSP?
- Can we implement an interface in a JSP?
- What is the difference between ServletContext and PageContext?
- What is the difference in using request.getRequestDispatcher() and context.getRequestDispatcher()?
- How to pass information from JSP to included JSP?
- How is JSP include directive different from JSP include action.
- Can we override the jspInit(), _jspService() and jspDestroy() methods?
- Why is _jspService() method starting with an '_' while other life cycle methods do not?
- Explain the life cycle of JSP?
- What happens when a page is statically included in another JSP page?
- A JSP page, include.jsp, has a instance variable "int a", now this page is statically included in another JSP page, index.jsp, which has a instance variable "int a" declared. What happens when the index.jsp page is requested by the client?
- Can you override jspInit() method? If yes, In which cases?
- What is the difference between directive include and jsp include?
- What is the difference between RequestDispatcher and sendRedirect?
- How does JSP handle runtime exceptions?
- How can my application get to know when a HttpSession is removed?
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