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| Question |
What is need of DAO? Write one simple DAO example? |
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Answer Posted By |
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Question Submitted By :: Sreenivas.lsvr |
| This Interview Question Asked @ IBM |
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I also faced this Question!! |
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| Answer | DAO: Data Access Object. here the main concept of DAO is to
communicate with the database. DAO mainly contains
1.) DAOFactory: this specifies which kind of database
(wether MySQL or ORACLE or MSSQL etc...).
2.) SQLFactory: which extends the DAOFactory. Here we do
all the connection stuffs.deciding te driver, hostname,
URL, username, password etc and also getting the Connection
object.
3.) AdminDAO: this is a interface where we declare all the
methods which we need in our application to perform all the
database related operation.
4.) SQLAdminFactory: this implements the AdminDAO
interface, all its method. this also gets the connection
from SQLFactory.
5.) TransactionControlDAO: here we keep the commit and
roolback methods.
if required...
6) ConnectionConstant: in this file we can mention the file
name (.properties file) where we keep the connection
detals, like hostname, username, password, etc...  |
| Naveen Kumar V |
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| Question |
What is the use of log4j and how to make use of
that in a application? |
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Answer Posted By |
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Question Submitted By :: Mahender |
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| Answer | log4j can be used for writing the log messages to various
kinds of destinations like a file, database, console etc...
It is always advisable to use some sort of logging API to
generate the log messages.the log messages helps the end
user as well as the developer of the application, to kow
about what the application has done and why the application
has failed, etc...
It is developed by Apache and this is used as part of
various products like hibernate, struts, strings etc...  |
| Suresh Gangula |
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| Question |
what is difference between vector and arraylist?.
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Rank |
Answer Posted By |
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Question Submitted By :: Guest |
| This Interview Question Asked @ HCL , C-DAC |
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I also faced this Question!! |
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| Answer | vector is synchronized . collection object and variable
slow acess. muntable
array list is never snchronized. collection variable fast
acess  |
| Guest |
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| Answer | Vector is synchronized and compare to array list this slow
access, by defaulst the vector is 10,this is legacy class
Where as arraylist is unsynchronized and fast random
access,in arraylist there is no default size automatically
it is growable once the object is created it will be
allocated,this is advanced class.  |
| Srinivas |
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| Question |
httt method |
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Answer Posted By |
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Question Submitted By :: Guest |
| This Interview Question Asked @ HCL |
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I also faced this Question!! |
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| Answer | doget,dopost,doput,dohead,dooption,dodelete,dotrace
doget method default method.  |
| Guest |
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| Question |
What is a constructor? |
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Answer Posted By |
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Question Submitted By :: Saru |
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I also faced this Question!! |
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| Answer | A constructor is one which is used to initialize the
instance variables of an object.  |
| Suma |
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| Answer | Guarrented intilization of instance variables of an object.  |
| Srinivasa Reddy |
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| Question |
which book is the best for preparing for SCWCD 1.5 |
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Answer Posted By |
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Question Submitted By :: Deepa |
| This Interview Question Asked @ Google |
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I also faced this Question!! |
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| Answer | SCWCD1.5 by Kathy Sierra is the Best Book  |
| Anilraju |
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| Answer | Head First Servlets & JSP  |
| Vaibhav |
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| Question |
what is the difference between banking and insurance domain? |
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Answer Posted By |
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Question Submitted By :: Nanunimavane@gmail.com |
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I also faced this Question!! |
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| Answer | vary simple answer is in banking domain you
to intracts with customers to manage their accounts
safty of their money ,easiy transation
methods ,management of diffrent barach account , all
possible way transation like electronic transations etc ,
report to client transation , Recovery of any flase
transation . And security of infornation ..
while in insurance domain any company define
their polocy and plan customer invest their money .
customer gets benefit accoding to their paln .but
in case any accident and injury . customer claims to
insurance company for their benefit .(now claim shold
be in differnt mode this accoding to software
requirements of the clients ). On the basis of their
claim compny provides benefit . otherwise customer can make
case to laws of country against the company .
There are so many type of insurance
are there . . .
i hope you get your answer or contact
mukesh 9242713864.  |
| Mukesh |
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| Question |
How to implement or use the singleton class in java? |
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Answer Posted By |
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Question Submitted By :: Ragini3 |
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I also faced this Question!! |
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| Answer | A singleton is an object that cannot be instantiated. At
first, that might seem counterintuitive - after all, we need
an instance of an object before we can use it. Well yes a
singleton can be created, but it can't be instantiated by
developers - meaning that the singleton class has control
over how it is created. The restriction on the singleton is
that there can be only one instance of a singleton created
by the Java Virtual Machine (JVM) - by prevent direct
instantiation we can ensure that developers don't create a
second copy.
We'll start with the class definition, for a SingletonObject
class. Next, we provide a default constructor that is marked
as private. No actual code needs to be written, but you're
free to add some initialization code if you'd like.
public class SingletonObject
{
private SingletonObject()
{
// no code req'd
}
}
So far so good. But unless we add some further code,
there'll be absolutely no way to use the class. We want to
prevent direct instantiation, but we still need to allow a
way to get a reference to an instance of the singleton object.  |
| Pinaki Mukherjee |
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| Answer | singleton is a design pattern. in this per application only
one object should exist.we implement it as follows:
public class abcd
{
private static abcd instance=null;
protected abcd()
{
//only to defeat instantiation;
}
public static abcd getInstance()
{
if(instance==null)
{
instance=new abcd();
}
return instance;
}  |
| Amit Sharma [Venqcorp] |
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| Question |
Is it possible to create Userdefined Unchecked Exception
also?If Yes, give an example? |
Rank |
Answer Posted By |
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Question Submitted By :: Shiva034 |
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I also faced this Question!! |
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| Answer | Yes,
public class UnCheckedExceptionExam extends RuntimeException
{
public UnCheckedExceptionExam(){
System.out.println("No argument");
}
public UnCheckedExceptionExam(String message){
System.out.println(message);
System.out.println(initCause(new Throwable("define
exception")));
}
public UnCheckedExceptionExam(Throwable cause){
System.out.println(cause.getCause());
}
public UnCheckedExceptionExam(String message,Throwable
cause){
System.out.println(message);
System.out.println(cause.getCause());
}
}  |
| Chinna |
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| Question |
whatis arguments &what is default argument |
Rank |
Answer Posted By |
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Question Submitted By :: Guest |
| This Interview Question Asked @ CTS |
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I also faced this Question!! |
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| Answer | Arguments are passed to parameters. Arguments are should
have some values, but parameters are declared in the
function, its only declaring the variables.
Default arguments depends on corresponding parameters.  |
| Sreenivas.lsvr |
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