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What is the difference between EJB3.0(CMP) and Hibernate
kumarsamba
- Dec 5th, 2009
The basic difference is EJB needs an application Server for its implementation whereas Hibernate needs only a web server for its implementation.
krishna_ballabh
- Jul 31st, 2009
EJB3.0 does provide the POJO features for ORM in JPA as well as all features of older version, in other word we can say that Entity Bean is no longer in EJB, to provide the same, specification is prov...
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How Inheritance interacts with encapsulation?
Ashwinshenoy7
- May 8th, 2011
There are two parts in this answer PART 1 : General explanationPART 2 : OOPS concept ( JAVA )PART 1 :1) Inheritance is the process by which one object ( Child class or also known as sub class ) a...
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Implement Very Large Queue
Suppose you have a very large queue, and you need to do a insert and delete on the queue. Since the queue is very large , you cannot keep the entire queue in the memory. How do you go about implementing such a condition?How do you go about inserting and deleting elements from that queue if you cannot keep the queue in the memory?
Ashwinshenoy7
- May 8th, 2011
Problems with large Queue :1) Space.2) Inserting and deleting.3) Time to perform operations.4) Additional cost.There are few ways to implement very large queues:1)Using flat-files:A "flat file&qu...
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What is design by contract? Explain the assertion construct?
Ashwinshenoy7
- May 8th, 2011
In every class or method, there will be a calling function and a called function.When ever a function(calling function) calls another function(called function), the called function is expected to repl...
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What is the difference between hash map and hash table?
swatinanu
- Aug 8th, 2011
Hash map is basically a collection API which is used to save data in sorted order avoiding duplicates. where hash table herits Object class. Hashtable is synchronized, whereas HashMap is not. This m...
Abid
- Jul 13th, 2011
The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls. (HashMap allows null values as key and value whereas Hashtable does not allow). HashMa...
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Why do we Typecast FormBean object with ActionForm in execute(...,...,...,..) method in Struts?
Public ActionForward execute(ActionMapping am,ActionForm af,Req,Res)
{
Myfornbean mf=(Myformbean)af;
//why we are typrcasting here -
Why do we pass ActionMapping object in Validate(...,..) method in struts?
Public ActionErrors validate(ActionMapping am,HttpServletRequest)
{
some validation logic...
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What is DAO?
amreenkhader
- Jan 20th, 2012
DAO decides to recieve the appropriate application from java and implemeting it a runtime...during execution..
chetan.nellekeri
- Apr 18th, 2011
DAO is Data Access Object.This is a pattern is used in most of the project throughout the industry.This class is the main medium between JAVA and JDBC.
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Explain the concept of design in a project and its life cycle
amreenkhader
- Jan 20th, 2012
Projects needs to be designed carefully which must be meaningful according to the readers and learners..It must be planned in such a way so that it can be followed easily a project should contain a meaninngful data related to topic prescribed
Ashwinshenoy7
- May 8th, 2011
Let me start with an example.Consider a development projectInitiation : Requirements gatheringPlanning : From the scratch to the end product based of the needs and requirements provided.Design: Once t...
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What is diffrence between java and java script?
amreenkhader
- Jan 20th, 2012
Java is the basic object oriented programmng language and Java script can be used in style sheets making and in HTML documentation
mani.sivapuram
- Feb 23rd, 2011
java-script is also same as like java only.But java is used in server side scripting and the javascript is used in client side scripting. I will say a real time scenario here consider the normal user...
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What is bit twiddling in Java?
Lokesh M
- Feb 10th, 2012
Bit Twiddling was used in earlier days for efficiency. It is a technique used for bit manipulation. Java bitwise and bit shift operators such as NOT, AND, OR, XOR, LEFT-SHIFT, RIGHT-SHIFT, UNSIGNED-RI...
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What is the usage of abstract method?
Lokesh M
- Feb 10th, 2012
Abstract classes used to implement polymorphism. Abstract class allows additional method declaration in the class.
Please read detailed discussion here http://www.geekinterview.com/question_details/19145
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Difference between java.sql.Date and java.util.Date
dineshxp
- Mar 19th, 2012
Java.util.date is used to show date and time of the system
java.sql.date is used to show the date of retrieved data from database and also it shows entered date to databaseNarendraKumar
- Mar 6th, 2012
Explanation: public class ((java.util.Date extends java.lang.Object)) implements java.io.Serializ able,java.lang.Cloneable,java.lang.Comparable java.sql.Date extends the java.uti.Date cls obj so jav...
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Log4J
How would we use log4J in our applications? Is it necessary to use log4J applications in our web application?
nabi_alam
- Mar 30th, 2012
To implement log4j in the web application there are different way. 1.we have to write a common logger class. 2.we have to configure corresponding class in web.xml and 3. we have to configure the prop...
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Application Security
How will you make sure to develop Java/J2EE projects/applications secured from hackers?Justify how Java projects are more secured than other languages?
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Design Pattern
What design pattern are available for J2EE?
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3-tier architecture in Java
Explain about 3-tier architecture in Java
ROOPESH JAMES
- May 21st, 2012
A three-tier architecture is any system which enforces a general separation between the following three parts: 1. Client Tier or user interface 2. Middle Tier or business logic 3. Data Storage Tie...
atilakmca
- Sep 27th, 2007
middle tier is primarly based on processing the bussiness logic. The main idea of dividing into tiers is like the application developer can concentrate on specific tier in developing webapplicati...
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What is difference between War file and Ear file?
patie
- May 22nd, 2012
JAR - Java ARchive Its a file format based on the ZIP file format and similar to ZIP format this is also used for aggregating many files (many be of different types) into one aggregate file. This agg...
what is difference between War file and Ear file?
- Oct 12th, 2011
jar files: These files are with the .jar extension. The .jar files contain the libraries, resources and accessories files like property files. .war files: These files are with the .war extension. Th...
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Problem with JSF / Spring security 2.5
Hello,
First I would say sorry I dont speak English very well...
I use the Spring framework 2.5 to apply the security rules for hand interception on the page in my application J2ee, I want that the page is only accessible when the user is connected.
The problem is that when I do:
the page still accessible by typing main.jsf !
and when I do:
the page... -
What is the main difference between jdk1.4 and jdk1.5
Rajesh
- May 31st, 2012
Different between jdk1.5 and jdk1.6 details Explain with code Example.?
ramanujsaraswati
- Jan 7th, 2009
Jdk 1.5 has various feature which was not in jdk 1.4. These new features are below-1)Annotation 2)AutoBoxing3)Enum support4)ForEach5)Generic implemention of Class, Method, WildCards, Bounded Type.6)Variable Argument support.
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