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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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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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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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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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What is the use of Marker Interface ?
Explain the purpose of Marker Interface.When there is no methods in marker interface then what is the use of implementing it?
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jasmin sheeba rani- Member Since Oct-2009 | Oct 6th, 2009
Marker interfaces are also called "tag" interfaces since they tag all the derived classes into a category based on their purpose. For example, all classes that implement the Cloneable interface can be cloned (i.e., the clone() method can be called on them). The Java compiler checks to make sure that if the clone() method is called on a class and the class implements the Cloneable interface.
jasmin sheeba rani
- Oct 6th, 2009
Marker interfaces are also called "tag" interfaces since they tag all the derived classes into a category based on their purpose. For example, all classes that implement the Cloneable interf...
VijayAravind
- Sep 18th, 2009
Marker Interface is a Java interface which doesnt have any methods in it. Marker Interfaces are Serializable, clonable, Singlethreaded model, Event listener. Marker interfaces are implemented by the class or its super class inorder to add some functionality.
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Explain how will you pass data from one Server(Tomcat) to another Server (WebLogic)?
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karunasagar- Member Since Jul-2008 | Jul 31st, 2008
One way of transferring data between JVMs across the network would be to use Tangosol's Coherence product (www. tangosol . com/coherence . jsp)karunasagar
- Jul 31st, 2008
One way of transferring data between JVMs across the network would be to use Tangosol's Coherence product (www. tangosol . com/coherence . jsp)
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Is WebSphere 6.0 and RAD 6.0 same?
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ahamza59- Member Since Jun-2009 | Jun 4th, 2009
They are the same app, just with 'Rational(tm)' branding instead of 'IBM(tm)' branding.
WSAD has been renamed to RAD. The change in name is to reflect IBM's acquisition and integration of the Rational product line.
WSAD does not have the version 6. WSAD's last version is 5. RAD starts with version 6. It is essentially the same IDE - they are both based on Eclipse and the numbering scheme continues.
WSAD 5 was based on the Eclipse 2.x series, whilst RAD 6 is based on Eclipse 3.x series.ahamza59
- Jun 4th, 2009
They are the same app, just with 'Rational(tm)' branding instead of 'IBM(tm)' branding. WSAD has been renamed to RAD. The change in name is to reflect IBM's acquisition and i...
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Is servlet is thread-safe?
PriyankN
- Mar 27th, 2011
Servlet is not thread safe, but that is because of the class/instance variables. So care must be taken to provide synchronized access to class/instance variables. Synchronizing entire service or doGet/doPost methods is bad and should be avoided.
Neha
- Nov 18th, 2007
Servlet is not thread safe by itself but u can make it thread safe by synchronizing the particular line's of service method.
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What is the advantage of mvc-2 over mvc-1?
PriyankN
- Mar 6th, 2011
The question itself is wrong. It should have been difference between Model1 and Model2. There is nothing called MVC1 in actual. The term MVC itself stands for Model-View-Controller, which clearly sepe...
paromita
- May 23rd, 2009
In MVC 1, the view is not separate from the controller... ie the presentation logic as well as the business logic is written in the same place. However, in MVC 2, the view is separate from the control...
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What is the difference between Abstract Factory Pattern and factory Pattern?
What is the difference between Abstract Factory Pattern and factory Pattern? When would you use each of them?
mani.sivapuram
- Feb 23rd, 2011
Abstract factory pattern is same as like factory pattern but in abstract factory pattern we? prepare a base class as abstract and we provide the implementation classes to the base class. In the clie...
rkj2ee2005
- Mar 19th, 2006
Abstract factory pattern is typically used for giving implementation to specification (eg., jdbc, servlet specifications etc...). Factory pattern is used when you want to defer object creation to lat...
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What is the right way of writing the code to get the servlet information using public String getServletInfo()?
mani.sivapuram
- Feb 23rd, 2011
By using the page directive as given below<%@ page info="hi this is the way
to write the code for getServletInfo() method" %>
mabhijit
- Jan 11th, 2008
Some applets and applications, for example, the Java Web Server Administration Tool, display information about a servlet. This information can include a short description of the purpose of the servlet...
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How Data Access Object (DAO) class will handle the data
Suppose there are 2500 records to be handled? How Data Access Object (DAO) class will handle it?
mani.sivapuram
- Feb 14th, 2011
When we send the data from front end like JSP or HTML etc then the controller is going to take the data and send it to service layer the service layer takes that data and send it to DAO layer in DAO l...
phdsong
- Aug 26th, 2008
DAO is one of design patterns. The Data Access Object (or DAO) pattern: 1. Separates a data resource's client interface from its data access mechanisms, 2. adapts a specific data res...
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How would you go about designing a better system?
Interviewer asked me this question in a interview. I could not give a clear answer. Can someone please help me to answer this question? Or point me to the websites that talk about How to Design a Good Software System. Thank you very much.
mani.sivapuram
- Feb 14th, 2011
when we want to solve a particular problem we are going to face so many problems and at last we are going find how to tackle this type of problem in future then if many people are using that par...
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What are the Action Classes?
mani.sivapuram
- Feb 10th, 2011
Action classes are like controllers in MVC architectures.Since when we send the request to server then action class is going to do the operation like it take the data from request object and send it to service layer according to required operation.
mabhijit
- Jan 11th, 2008
The action classes are the link between the Struts framework and your business application logic. The fact that the main method in the action class is called "perform" indicates that the act...
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Which (stack or heap) memory will be allocated when an object is created using new operater?
mani.sivapuram
- Feb 10th, 2011
When an object is created using new operator then JVM creates object and place that object in heap memory. and stack area is used to store object referances and methods and variables.
mmptce
- Sep 25th, 2007
Heap memory is allocated for the objects and the instance variables that are created by using new operator.Stack memory is for the method call and thread call.
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What is the advantage of using static methods in real time applications?
When we use static methods and when we use final methods? Explain with a suitable example..
mani.sivapuram
- Feb 10th, 2011
Generally static methods are loaded when we load the class into JVM itself.so without creating any object we can access those methods.
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Class and Conductor Variable
What is major difference in assigning a variable in class and assigning a variable in constructor?
Kiran Chaturvedula
- Jan 20th, 2011
A Constructor Class is a class that is used to create a new class using the "new" keyword. Any variable declared under this constructor class will be a "Class Variable" meaning all...
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WeakHashMap
Explain how a WeakHashMap works?
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Servlet Intialization Parameter
How we can define Servlet Initalization Parameter?
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