Answer / mukundvishy

Two tier is Client Server architecture. For example using
Oracle database and Oracle Forms/VB.

3 tier is introducing one more tier. For example, a web
server (IIS, Apache, Tomcat etc.), an EJB Application server
(Weblogic, websphere etc.) and a database (oracle, sql
server etc.)

Statement, PrepareStatement and Callable all these are interfaces. Thought it is a interface how come we are creating objects and calling methods("preparestatement()") in it. In which class this method is defined. Please let me know. Thanks in advance. example: PreparedStatement pre = con.prepareStatement( "UPDATE COFFEES SET SALES = ? WHERE COF_NAME LIKE ?");

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