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MVC architecture
what is the difference between MVC1 & MVC2 in Java?
sivapurammani
- Jul 10th, 2013
MVC(Model-View-Controller) :: This type of architecture makes our code to be reusable and separation of code. View :: Which presents the modal data, example if we are presenting any tabular data or c...
Prasad MN
- Mar 11th, 2013
MVC1: Its a model view Controller architecture 1 that means all the presentation logic and business logic is mixed up. If any modification is required on its impact on the logic. Difficult ...
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What is singleton class?
What is the exact use of singleton class?Just using private class constructor makes it a singleton class?
Abhishek Marshetty
- Nov 18th, 2015
The Singletons purpose is to control object creation, limiting the number of obejcts to one only. Since there is only one Singleton instance, any instance fields of a Singleton will occur only once pe...
ayush48
- Jun 22nd, 2015
A class having only one object or only one object of that class can be created.
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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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Adding Method in Java
Hi I have interface in that interface 3 methods are there , after some days client said that,i want to add one more method in that interface ,so how can add 4 method so that the implemented class did not affect, Thanks Kalins Naik
sivapurammani
- Jul 4th, 2013
If we implement any new method in Interface then by default that method is public and abstract, So the classes which are implementing that interface should implement that method that is one way in whi...
akii
- Apr 30th, 2013
Make a class abstract in this class you do not need to implement all methods of interface .
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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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why we are using OOPS?
sivapurammani
- Dec 16th, 2013
Before introducing OOPS some other concepts are also introduced into the computer world, for example Procedure Oriented Language(The best example for this is C language) but these concepts are working...
mukesh jha
- Aug 8th, 2013
OOPS stands for object oriented programming . They are 1. Abstraction 2. Encapsulation 3. Inheritance 4. Polymorphism Abstraction is representation of some property without giving backgroun...
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toString function
What is the default value for toString() in java? Explain me with an example?
sivapurammani
- Jul 10th, 2013
Default value is String representation of any Object. "java class Student { int rollNo; String name; public Student(int rollNo, String name){ this.rollNo = rollNo; this.name = n...
Nikhil
- Feb 21st, 2013
If toString() method is not overriden, it will return
public String toString() {
return getClass().getName() + "@" + Integer.toHexString(hashCode());
}
This is Object version of this method. -
Synchronization in Java
When We should use Synchronization in Java and when we should not?
sivapurammani
- Dec 16th, 2013
In simple terms we can say only one thread can act on selected resource(method or variable). Understanding the above sentence is as follows:: For example we are booking any ticket in a particular bu...
Yeswanth
- Dec 6th, 2013
If you want to allow only one thread at a time to access block of code or method then we will go for synchronization.
Code- public synchronized
- void singleProcess() {
- // Insert code here
- }
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what is the difference between abstract class & Final class
Manjunath_7_89
- Mar 25th, 2016
Abstract Class
1. Could be Inherited.
2. Couldnt instatiated.
3. Could add few more methods.
4. Incomplete class
Final Class
1. Final version of Class
2. Couldnt be inherited.
3. Could be instantiated.
4. Couldnt add any more methods.baban
- Feb 11th, 2016
Abstract class cannot create object but final class create a object
abstract class which have must a subclassed but final class which have no subclassed -
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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Is java a fully object oriented programming or not? if not why?
Read Best Answer
Editorial / Best Answer
KanikaKG- Member Since Jul-2008 | Aug 4th, 2008
No. Java is not 100 % Pure OOP because of following three reasons:
1) It doesnot support Multiple inheritance.
2) It allows use of primitive data types which are not an objects.
3) It allows static methods to call without creating the instance.
This disobeys OOPs concepts
Java isnt 100% pure OOPS coz if it were then everything should be classes and objects, whereas java still has primitive data type which violates the above said statement...SmallTalk is the only 100% pure OOPS languageChaitra
- Jun 6th, 2019
Java is not a pure object oriented programming language because of the primitive data type.
But java can be made 100% object oriented programming language by making use of wrapper classes.Amit Kumar
- May 21st, 2018
Sorry, I am completely agree that java is a pure object oriented language. First of all answer me one question , what do you mean by object oriented programming ? object oriented programming is a conc...
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What is the purpose of garbage collection
The purpose of garbage collection is to identify and discard objects that are no longerneeded by a program so that their resources may be reclaimed and reused.
sivapurammani
- Dec 17th, 2013
In simple terms we can say garbage collector removes the unreferenced objects from the memory. In general the memory should have some limitation. In JVM for accomplishing tasks we create objects and ...
pardeep131085
- Aug 21st, 2013
garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects. An in use object, or a referenced object, means th...
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What is the difference between static and non-static variables
A static variable is associated with the class as a whole rather than with specific instancesof a class. Non-static variables take on unique values with each object instance.
sivapurammani
- Dec 17th, 2013
Static variables are class variables, we can access these variables using class name and the variable value remains same for all the objects. Generally we can use these static variables as constants f...
Arvindanathan
- Dec 3rd, 2013
"c //feel it by doing package com.practise; public class StaticStringDemo { static String strObject1; String strObject2; public static void main(String args[]) { StaticStr...
