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how many design pattern r there? and wht design pattern u
use and why ?
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Answer Posted / hima bindu
so many design patterns are used for solving the reoccurs
problems.Mainly these design patterns are used for EJB
Application.They are
1.Front Controller - handling all the requests form client.
2.Application Controller/Business deligate - this is used
for delgate the request to appropriate method in business class.
3.Service Locater -- this is used for the get the reference
of home object.
4.Data Access Object -- It is uesd for connecting with the
databases like hibernate,jdbc connections,JNDI and Etc.
5.Data Transfer Object/Value Object --- if you want to
transfer the data from bean to client and vice-versa.We
create one helper class.In this class we r writing some
setters and getters are used for data transfer.
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