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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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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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How will you make session more secure in JSP?
elanchezhian
- Jun 11th, 2012
By using Cookies
mani.sivapuram
- Feb 14th, 2011
since sessions are created by server only but by using session with cookies (or) session with url encoding techniques we set the session id in the client system.If we want to maintain secure data abou...
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What is the difference between thin client and thick client?
Sandhya.Kishan
- Jun 19th, 2012
Thin Clients 1.Easy to deploy as they require no extra or specialized software installation 2.The data captured is verified by the server. 3.Clients run only and exactly as specified by the server 4.R...
jyotsna
- Apr 20th, 2006
Thin client is browser based and thick client is window based
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Driver manager
What is driver manager?
Sandhya.Kishan
- Jun 19th, 2012
The Driver Manager is a library that manages communication between applications and drivers.The Driver Manager is used solves a number of problems related to determining which driver to load based on a data source name, loading and unloading drivers, and calling functions in drivers.
dev patel
- Jun 16th, 2012
In jdbc- object which can connect java application to a jdbc driver that is called driver manager.
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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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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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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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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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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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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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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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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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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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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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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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