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Use of Helper classes

 
Mohankumar G
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Can any one help me in explaining the need of helper classes and where we can use it?
 
Pradeep bhatt
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You mean Helper classes for EJB?
 
Mohankumar G
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Yes. for EJB
 
Vishwa Kumba
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One example that I have come across is :
Order and OrderlineItems. These need not be 2 different Entity Beans.
The design could have only 1 EJB, the OrderEJB containing a Collection of
OrderlineItems, which are just simple java classes, called as Helper Classes. Orders and OrderlineItems are still stored in different tables.
 
Pradeep bhatt
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You could have a helper class for sending confirmation emails to Customers.
 
Sivasundaram Umapathy
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Helper classes can be used as dependent objects(OrderlineItems of vishkumar) or may be as Value Object POJO's or as Utility classes (like email sender of pradeep).
 
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