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Java Interview Questions Part 1 2007-10-01 14:14:25 1. Can there be an abstract class with no abstract methods in it?
Yes
2. Can an Interface be final?
No
3. Can an Interface have an inner class?
Yes.
public interface abc
{
static int i=0; void dd();
class a1
{
a1()
{
int j;
System.out.println(”inside”);
};
public static void main(String a1[])
{
System.out.println(”in interfia”);
}
}
}
4. Can we define private and protected modifiers for variables in interfaces?
No
5. What is Externalizable?
Externalizable is an Interface that extends Serializable Interface. And sends data into Streams in Compressed Format. It has two methods, writeExternal(ObjectOuput out) and readExternal(ObjectInput in)
6. What modifiers are allowed for methods in an Interface?
Only public and abstract modifiers are allowed for methods in interfaces.
7. What is a local, member and a class variable?
Variables declared within a method are “local” variables. Variables declared within the cl
EJB Interview Questions 2007-10-01 13:35:09 2. What is session Facade?
Session Facade is a design pattern to access the Entity bean through local interface than accessing directly. It increases the performance over the network. In this case we call session bean which on turn call entity bean.
3. What is EJB role in J2EE?
EJB technology is the core of J2EE. It enables developers to write reusable and portable server-side business logic for the J2EE platform.
4. What is the difference between EJB and Java beans?
EJB is a specification for J2EE server, not a product; Java beans may be a graphical component in IDE.
5. What are the key features of the EJB technology?
1. EJB components are server-side components written entirely in the Java programming language
2. EJB components contain business logic only - no system-level programming & services, such as transactions, security, life-cycle, threading, persistence, etc. are automatically managed for the EJB component by the EJB server.
3. EJB architecture is inherently trans
Java System Design & Analysis Patterns Interview Questions 2007-11-04 12:59:49 1. What is an analysis pattern?
2. What are the differences between analysis patterns and design patterns?
3. How does “Extreme Programming” (XP) fit with patterns?
4. What is the disadvantage of using the Singleton pattern? It is enticing to use this pattern for all the classes as it makes it easy to get the reference of the singleton object.
5. How do you write a Thread-Safe Singleton?
6. What is the Reactor pattern?
7. What are Process Patterns
?
8. How and where did the concept of design patterns get started?
9. Where can I find good examples of the Prototype pattern?
10. What are Anti-Patterns?
11. What is a software design pattern?
12. Why is the study of patterns important?
13. How do I document a design pattern?
14. Where can I learn more about design patterns?
15. What is an example of a design pattern?
16. Calendar is an abstract class. The getInstance() method tries to instantiate GregorianCalendar() i.e., parent instantiating a derived class. This looks Non-OO? E Read more:System
, Analysis
42 Important EJB Interview Question 2007-11-26 00:38:04 1. What is EJB
EJB stands for Enterprise JavaBean and is a widely-adopted server side component architecture for J2EE. It enables rapid development of mission-critical application that are versatile, reusable and portable across middleware while protecting IT investment and preventing vendor lock-in.
2. What is session Facade?
Session Facade is a design pattern to access the Entity bean through local interface than accessing directly. It increases the performance over the network. In this case we call session bean which on turn call entity bean.
3. What is EJB role in J2EE?
EJB technology is the core of J2EE. It enables developers to write reusable and portable server-side business logic for the J2EE platform.
4. What is the difference between EJB and Java beans?
EJB is a specification for J2EE server, not a product; Java beans may be a graphical component in IDE.
5. What are the key features of the EJB technology?
1. EJB components are server-side components written entirely in the Ja Read more:Question
Advanced enterprise Java Interview Questions 2008-04-04 15:36:42 1) What is the purpose of garbage collection in Java, and when is it used?
The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources can be reclaimed and reused. A Java object is subject to garbage collection when it becomes unreachable to [...] Read more:enterprise
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