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Why java Soft has declared HttpServlet Class as an Abstract class?Is there any performance issue?
In HttpServlet class there is no any abstract method although javasoft declared this class as an abstract
class.Ok,this is valid in java.So if we want to utilize this class we will have to extends this class.But we can use to achieve this one by using Httpservlet class as simple java class also.
Ganesh Bhat
- Apr 3rd, 2015
The interface of HttpServlet is complete, but not the implementation/functionality of it. abstract restricts a developer to use the HttpServlet as is, rather it forces the developer to extend it and p...
Sandhya.Kishan
- Jul 4th, 2012
Java soft has declared httpservlet class as an abstract class for its performance, scalability and reusability issues and for security purpose.
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XML Parsing
For parsing a big XML and modifying it (removing empty element), which parser should we use?
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What is connection pooling?
CareerBaba.in
- May 7th, 2014
Opening database connection is a time consuming operation. Connection pooling increases the performance of the applications by reusing the active database connections instead of create new connection ...
mani.sivapuram
- Feb 23rd, 2011
In the previous days database connections are maintained by database only for example oracle database is having 10 database connections are there.Consider at the same time 10 clients are asked for a p...
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Java single inhertiance and multiple inheritance
1.what is meant by inheritance,single inhertiance,multiple inheritance?2.define abstract class & abstract method?3.how to developed and delopying a SERVELT,JSP program in the TOMCAT APACHE SERVER,WEBLOGIC SERVER?PLZ send the answer for the particular abo
sivapurammani
- Jan 23rd, 2014
Inheritance :: Inheriting the properties and actions(methods) of Super class to Sub-class is the main concept of Inheritance. In java by using extends or implements are the two ways we can go for the ...
harps
- Nov 20th, 2012
Single Inheritance in Java means that a sub class have the capability of inheriting the properties of only one class whereas multiple inheritance is not supported by Java as it increases the complexit...
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What is the difference between jsp tag and html tag
sivapurammani
- Jan 23rd, 2014
JSPs are residing in server-side where as in general HTML are in client side. In clear way we can say in server side we need to write the code in java format or HTML and other formats too. So at the...
Prasad MN
- Dec 17th, 2012
Both the tags are used to developing the web pages. HTML tags are static. Where as JSP tags are dynamic.
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Cloning
What is Cloning? Why we are using Cloning concept? and How many types of cloning?
sivapurammani
- Jan 23rd, 2014
Cloning is used in some of the ares of the Web Projects. Consider one example we are trying insert some data into DB then what we will do is we are create one java object for that(See creating java ob...
surendar
- Jul 16th, 2012
Cloning is the process of creating duplicate copy with current object state. We use this concept in real world like, eg: In Bike manufacturing company, we use cloning for creating same bike object,...
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Java-Class variable Vs Instance variable
Some body please tell me what is the difference between class variable and instance variable???
sivapurammani
- Jan 23rd, 2014
Class variable :: It is a variable which we can access this variable by using class name and another advantage is when the class loads in ClassLoader(i.e JVM) at that time itself the variable is initi...
qamrun
- Nov 8th, 2012
Static variable, the field is allocated when the class is created. It belongs to the class and not any object of the class. It is class variable. Instance variable, the field is allocated when the c...
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Core Java
Why thread has created in Two ways and why not in one way or three ways? Anyone please help me to get the Answer
ashis
- Aug 6th, 2013
When one class already extend by another then we can not extend thread class,but we can implement interface.Interface is used for multiple inheritance and also for factory design patten,that will help to create the thread .
mikhailguzman
- Mar 19th, 2013
Creating thread is basically instantiate the Thread class. There are two ways to instantiate class: with extend or implementation of interface.
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Synchronization tool
What is synchronization and what are tools of synchronization ?
manoj.arah
- Apr 25th, 2013
Synchronization is the process of allowing threads to execute one after another. Synchronization control the access the multiple threads to a shared resources. Without synchronization of threads, one ...
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Why is that the final variable has to be initialized as soon as it is declare?
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Editorial / Best Answer
r.praveenkumar- Member Since Oct-2007 | Aug 1st, 2008
when a variable is declared as final we cant change its value again. we use final variable to declare a constant so when we declare a variable as final and if we were allowed to not to give its value at the time of declaration it would not make sense so people who designed java made mandatory to give the value when we declare a final variable. then only it will be sensible.
final PI=3.14;
then we cant change PI's value. think if the above statement do not contain a vl it would not make sense.Nitin Maulekhi
- Jul 18th, 2012
final keyword can be applied on:- 1.class 2.member functions(only non-static) 3.data-members(both static and non-static) 4.local variables. 1.by making a class final ,that class cannot be inherited....
Rohit Verma
- Jul 10th, 2012
Like any variable, a final variable can also be first declared and then assigned a value. But it can be only assigned a value once and only once ( as its final variable ). for example :- final Strin...
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Available methods in synchronization ?
dhayasinfo
- Jul 16th, 2012
Synchronization is a process by using Synchronize keyword to prevent the dead lock. This can be used in methods or block to prevent two threads to access the same resource in the same time.
amreenkhader
- Jan 20th, 2012
In this two threads cannot use the same resource simultaneously beacuse the thread execution gets interrupted or terminated hence only a single thread can share resource at a time.
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Thread Priority Levels
How many THREAD PRIORITY LEVELS levels are there in JAVA
3810 1224Sandhya.Kishan
- Jul 4th, 2012
The priority of thread can be max,norm and min depending on the underlying os or JMV.
almas_23
- Aug 18th, 2008
The thread priority levels in terms of integer range from 1 to 10For max, min & medium priority we have the following:MAX_PRIORITY (value=10)NORM_PRIORITY (value=5)MIN_PRIORITY (value=0)
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What is .xba file?
Ashwinshenoy7
- May 8th, 2011
Let me tell you where exactly it is used and what it does as per my knowledge.Application library used by OpenOffice.org, an open-source productivity suite; contains the functionality for the componen...
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Servlet as the shared object
Can we use a Servlet as the shared object
Sandhya.Kishan
- Jul 4th, 2012
We can use servlet as a shared object by using as shared object the servlet can maintain its state by using its init() and destroy() methods to load and save its state.
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