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Question 16 :

What is throw ?

Answer :

A Java keyword that allows the user to throw an exception or any class that implements the "throwable" interface.

Question 17 :

What is throws ?

Answer :

A Java keyword used in method declarations that specify which exceptions are not handled within the method but rather passed to the next higher level of the program.

Question 18 :

What is transaction ?

Answer :

An atomic unit of work that modifies data. A transaction encloses one or more program statements, all of which either complete or roll back. Transactions enable multiple users to access the same data concurrently.

Question 19 :

What is transaction isolation level ?

Answer :

The degree to which the intermediate state of the data being modified by a transaction is visible to other concurrent transactions and data being modified by other transactions is visible to it.

Question 20 :

What is transaction manager ?

Answer :

Provides the services and management functions required to support transaction demarcation, transactional resource management, synchronization, and transaction context propagation.