Objective Java Multiple Choice Questions Part 1

1. If there is a need to use relation join to improve system performance, which EJB will be used ?

a.       Stateful

b.       CMP

c.       Stateless

d.       BMP

2.       What is the use of DAO in Fast Lane Reader pattern

a.       Plug & Play

b.       Hides code complexity

c.       Easier to code

d.       Access DB to get all read-only data efficiently

3.       Among the following what are supported by entity? (CB)

a.       Data encapsulation

b.       Reusability

c.       Over loading

d.       Polymorphism 

e.       Inheritance 

4.       MDB holds conversation state of client 

a.       True

b.       False

5.       Tom wants API that removes persistent entity instance, finds entities, allows query to run on entities. What should we refer to?

a.       Database API

b.       JNDI API

c.       Serialize API

d.       Entity Manager

6.       Difference between JMS server call and MDB from any client.

a.       In MDB , JMS connection factory look for DB home object

b.       Client call to both JMS server and MDB is same

c.       None

d.       Queue/Topics are mapped to MDB

7.       @SequenceGenerator(name=”book_sequence”, sequenceName=”bookId”) public class Book implements Serializable

What is the sequence from which the sequence gets generated ?

a.       Null

b.       0 

c.       1(correct ans)

d.       Exception thrown

8.       What annotation is used for openConnection method

a.       @prePassivate(correct ans)

@postConstruct

openConnection()

b.       @postActivate

@postConstruct

openConnection() 

c.       @preActivate

openConnection()

d.       @preActivate

@postDestroy

openConnection()

9. How are EJB references cached

a.       EJB Home

b.       EJB Home Interface

c.       Persistence.xml

d.       Servlets

10.     How many types of messaging are there

a.       7

b.       5

c.       4

d.       2