The main feature of a PreparedStatement object is that, 
unlike a Statement object, it is given an SQL statement 
when it is created. The advantage to this is that in most 
cases, this SQL statement is sent to the DBMS right away, 
where it is compiled. As a result, the PreparedStatement 
object contains not just an SQL statement, but an SQL 
statement that has been precompiled. This means that when 
the PreparedStatement is executed, the DBMS can just run 
the PreparedStatement SQL statement without having to 
compile it first. 

Callable Statement:A CallableStatement object provides a 
way to call stored procedures in a standard way for all 
DBMSs. A stored procedure is stored in a database; the call 
to the stored procedure is what a CallableStatement object 
contains. This call is written in an escape syntax that may 
take one of two forms: one form with a result parameter, 
and the other without one. A result parameter, a kind of 
OUT parameter, is the return value for the stored 
procedure. Both forms may have a variable number of 
parameters used for input (IN parameters), output (OUT 
parameters), or both (INOUT parameters). A question mark 
serves as a placeholder for a parameter
BatchUpdates:
A batch update is a set of multiple update statements that 
is submitted to the database for processing as a batch. 
Sending multiple update statements to the database together 
as a unit can, in some situations, be much more efficient 
than sending each update statement separately. This ability 
to send updates as a unit, referred to as the batch update 
facility, is one of the features provided with the JDBC 2.0 
API.