why do we typecast ActionForm into our plain java bean
class in Action class? What is the reason?

Answers were Sorted based on User's Feedback



why do we typecast ActionForm into our plain java bean class in Action class? What is the reason?..

Answer / kranthi kumar

As far as my knowledge is concerned.ActionForm is super
class and the bean class is sub class of ActionForm.So in
the action class it is downcasting that is performed and
downcasting in java needs an explict casting.

Is This Answer Correct ?    9 Yes 1 No

why do we typecast ActionForm into our plain java bean class in Action class? What is the reason?..

Answer / kiran

Action Form is basically sub class of Action Form Class.
When we want to assign super class with subclass object type
casting is required.

Is This Answer Correct ?    4 Yes 2 No

why do we typecast ActionForm into our plain java bean class in Action class? What is the reason?..

Answer / kartheeswari

ActionForm is a parent class for our userdefined formbean.
Ex. MyBean,means which has to be extended the ActionForm.

when we try to assign a parent class into subclass we need
downcasting.

Is This Answer Correct ?    1 Yes 0 No

why do we typecast ActionForm into our plain java bean class in Action class? What is the reason?..

Answer / supra

Use ActionForm to work on session data

In a Struts-based Web application, each ActionForm extends
org.apache.struts.action.ActionForm. These ActionForms
encapsulate page data and provide a validation framework to
validate request parameters.

Most Web applications maintain data in session to make them
available throughout the application. This best practice
addresses this Web application feature. It allows methods
toSession() and fromSession() to move session data to and
from the form data. Thus, it addresses session data
maintenance in a Web application.

To adhere to this practice, follow these steps:

Create an abstract class named BP3Form by extending
org.apache.struts.action.ActionForm.
In BP3Form, add methods with access modifiers as in public
abstract void toSession(SessionData sessionData) and void
fromSession(SessionData sessionData).
In every ActionForm, extend BP3Form and implement the
abstract methods in which the form data is transported to
and from the session.
The corresponding Action class may determine the order in
which these methods are called. For example, you could
invoke method toSession() on the ActionForm just before
actionForward is determined.
When to use this practice

This practice is most useful when session data is
maintained as a single object and/or every page manipulates
or uses session data.

Is This Answer Correct ?    1 Yes 5 No

Post New Answer

More Struts Interview Questions

What is the purpose of execute method of action class?

0 Answers  


why do we typecast ActionForm into out plain java bean class in Action class?

5 Answers  


what happen if the private constructor is written in a claass

6 Answers  


What is spring and struts in java?

0 Answers  


What are result types in struts?

0 Answers  






how you implement and maintain your struts project by using MVC2 arch?

2 Answers   Patni, Wipro,


drawback of Validation Framework where and how to write the connection pool object in the programe how to debug the programe and application in struts without using eclips

1 Answers  


What is s token?

0 Answers  


What is the purpose of constant tag in struts.xml?

0 Answers  


Hi i am murali.i need a excellent answer for the question Tell me about project and project flow ? i mean it is use full to any project,it is on STRUTS

2 Answers  


Name some of the features of struts2?

0 Answers  


What are the core components of a struct2 based application?

0 Answers  


Categories