Answer / kalyan

Bascially DAO is used in three tier architecture.
Three tire architecture is comprised of the following layers

1.Presentaion layer
2.Business layer
3.Data Access layer

Data Access layer will have all the code to intercat with
the data base server.so that when next time the data base
server is changed there is no need to chane in the present
and business layers.

please mail me the interview question based on java/j2ee

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