Interview Questions Recruitments

Can you suggest me some general interview questions that are being asked by companies for recruitment of Java professionals? I just have completed my diploma in Java and now planning to apply for Java programmer.

Here I have attached a file for you having the Interview Questions for recruitment of Java professionals the attached file contains following questions:


Q:What is Struts?
A:The core of the Struts framework is a flexible control layer based on
standard technologies like Java Servlets, JavaBeans, ResourceBundles, and
XML, as well as various Jakarta Commons packages. Struts encourages
application architectures based on the Model 2 approach, a variation of the
classic Model-View-Controller (MVC) design paradigm.
Struts provides its own Controller component and integrates with other
technologies to provide the Model and the View. For the Model, Struts can
interact with standard data access technologies, like JDBC and EJB, as well
as most any third-party packages, like Hibernate, iBATIS, or Object
Relational Bridge. For the View, Struts works well with JavaServer Pages,
including JSTL and JSF, as well as Velocity Templates, XSLT, and other
presentation systems.

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Here I am Providing you the Interview Questions for recruitment of Java professionals the attached file contains following questions:



Q:What is Struts?
A:The core of the Struts framework is a flexible control layer based on
standard technologies like Java Servlets, JavaBeans, ResourceBundles, and
XML, as well as various Jakarta Commons packages. Struts encourages
application architectures based on the Model 2 approach, a variation of the
classic Model-View-Controller (MVC) design paradigm.
Struts provides its own Controller component and integrates with other
technologies to provide the Model and the View. For the Model, Struts can
interact with standard data access technologies, like JDBC and EJB, as well
as most any third-party packages, like Hibernate, iBATIS, or Object
Relational Bridge. For the View, Struts works well with JavaServer Pages,
including JSTL and JSF, as well as Velocity Templates, XSLT, and other
presentation systems.
The Struts framework provides the invisible underpinnings every
professional web application needs to survive. Struts helps you create an
extensible development environment for your application, based on
published standards and proven design patterns.

Q:What is Jakarta Struts Framework?

A:Jakarta Struts is open source implementation of MVC (Model-View-
Controller) pattern for the development of web based applications. Jakarta Struts is robust architecture and can be used for the development of
application of any size. Struts framework makes it much easier to design
scalable, reliable Web applications with Java.

Q:What is ActionServlet?
A:The class org.apache.struts.action.ActionServlet is the called the
ActionServlet. In the the Jakarta Struts Framework this class plays the role
of controller. All the requests to the server goes through the controller.
Controller is responsible for handling all the requests.

Q:How you will make available any Message Resources Definitions file
to the Struts Framework Environment?
A:T Message Resources Definitions file are simple .properties files and these
files contains the messages that can be used in the struts project.

Q:What is Action Class?
A:The Action Class is part of the Model and is a wrapper around the business
logic. The purpose of Action Class is to translate the HttpServletRequest to
the business logic. To use the Action, we need to Subclass and overwrite the
execute() method. In the Action Class all the database/business processing
are done. It is advisable to perform all the database related stuffs in the
Action Class. The ActionServlet (commad) passes the parameterized class to
Action Form using the execute() method. The return type of the execute
method is ActionForward which is used by the Struts Framework to forward
the request to the file as per the value of the returned ActionForward object.

Q:What is ActionForm?

A:An ActionForm is a JavaBean that extends
org.apache.struts.action.ActionForm. ActionForm maintains the session
state for web application and the ActionForm object is automatically
populated on the server side with data entered from a form on the client
side.

Q:What is Struts Validator Framework?
A:Struts Framework provides the functionality to validate the form data. It can
be use to validate the data on the users browser as well as on the server
side. Struts Framework emits the java scripts and it can be used validate
the form data on the client browser. Server side validation of form can be
accomplished by sub classing your From Bean with DynaValidatorForm
class.
The Validator framework was developed by David Winterfeldt as third-party
add-on to Struts. Now the Validator framework is a part of Jakarta
Commons project and it can be used with or without Struts. The Validator
framework comes integrated with the Struts Framework and can be used
without doing any extra settings.


Q:Give the Details of XML files used in Validator Framework?
A:The Validator Framework uses two XML configuration files validatorrules.
xml and validation.xml. The validator-rules.xml defines the standard
validation routines, these are reusable and used in validation.xml. to define
the form specific validations. The validation.xml defines the validations
applied to a form bean.


Q:How you will display validation fail errors on jsp page?
A:Following tag displays all the errors:

Q:How you will enable front-end validation based on the xml in
validation.xml?
A:The tag to allow front-end validation based on the xml in
validation.xml. For example the code
formName dynamicJavascript staticJavascriptgenerates the client side java script for the form
as defined in the validation.xml file. The when added in the jsp file generates the client site validation script.


Q:How to get data from the velocity page in a action class?
A:We can get the values in the action classes by using data.getParameter

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