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.

What is the difference between comparable and comparator in java.util pkg?

0 Answers  

---

what is jndi?

2 Answers  

---

what are callback methods?

3 Answers   iFlex,

---

please mail me the interview question based on java/j2ee

0 Answers   Wipro,

---

In hyderabad, which s/w training center is best for java, other than corejava what r the new tools to learn in java,which tool is best & have current requirement,pls give me information about java to learn ?

0 Answers  

---

what protocols does JNDI provide an interface to?

1 Answers  

---

What is a constructor?

4 Answers  

---

Which java collection class can be used to maintain the entries in the order in which they were last accessed?

0 Answers  

---

In HashSet duplicates are allowed while adding to the HashSet, but while retreiving the object from HashSet is not shown the duplicate values, WHY ?

2 Answers   Cap Gemini,

---

What are the uses of the set interfaces in the java collections? : java collections

0 Answers  

---

What are maps interfaces in the java collections? : java collections

0 Answers  

---

Which is the better framework for web applications, struts or spring, and why?

1 Answers   IBM, TATA,

---