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What is difference between instance and object.?what are the all difference between interface and abstract class?
heena
- Feb 15th, 2012
Object is a instance of a class. Instance is the occurence of the object of class which defines its state and behavior.
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What is difference between runnable and thread ?why we use static class
AMIT GURJAR
- Sep 21st, 2012
Sir please tell me that when a thread never return desired result then why we use it?
prabakaran29
- Aug 19th, 2012
Thread class can be extend only one class where as we using runnable interface can be implement many classes.so runnable interface is the best to implement the block of code
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What will be the result and why
int i=10;i=i++;System.out.println(i);
jawaharl0207
- Nov 30th, 2009
11, because even it is post increment, it will increment by 1 when it is going to reach println() statment, for the first statement(i++;) it wont increment, after completing the execution of this method i incremented by 1 and prints the result.
sujithkthomas
- Nov 12th, 2009
Yes this is similar totemp = i;i = i+1;i = temp;It will restore the value 10 since post increment. If its pre-increment last assignment will be i = temp+1
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JVM is platform independent/dependent? why?
which one is faster in execution Array List or Array? why?
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Can we declare multiple main() methods in multiple classes.ie can we have each main method in its class in our program?
r.praveenkumar
- Aug 6th, 2008
Yes I tested this we can have main method in two different classes this will not give error and we should save that doc with the class name which has the main we want to be executed first and inside t...
vinaymudgil007
- Jun 3rd, 2008
Yes this is possible...... but within a single file only one class can be declared puiblic!!!!and whichever class you run, that class's main() mentod would be called.......vinny
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What is MVC architecture
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Answered by: Mitchel K
- Jun 27th, 2005
A design pattern describes a proven solution to a recurring design problem, placing particular emphasis on the context and forces surrounding the problem, and the consequences and impact of the solution.
There are many good reasons to use design patterns. Here are three:
1) They are proven. You tap the experience, knowledge and insights of developers who have used these patterns successfully in their own work.
2) They are reusable. When a problem recurs, you don't have to invent a new solution; you follow the pattern and adapt it as necessary.
3) They are expressive. Design patterns provide a common vocabulary of solutions, which you can use to express larger solutions succinctly.
The goal of the MVC design pattern is to separate the application object (model) from the way it is represented to the user (view) from the way in which the user controls it (controller).
The MVC architecture has the following benefits:
1) Multiple views using the same model: The separation of model and view allows multiple views to use the same enterprise model. Consequently, an enterprise application's model components are easier to implement, test, and maintain, since all access to the model goes through these components.
2) Easier support for new types of clients: To support a new type of client, you simply write a view and controller for it and wire them into the existing enterprise model.
3) Clarity of design: By glancing at the model's public method list, it should be easy to understand how to control the model's behavior. When designing the application, this trait makes the entire program easier to implement and maintain.
4) Efficient modularity: of the design allows any of the components to be swapped in and out as the user or programmer desires - even the model! Changes to one aspect of the program aren't coupled to other aspects, eliminating many nasty debugging situations. Also, development of the various components can progress in parallel, once the interface between the components is clearly defined.
5) Ease of growth: Controllers and views can grow as the model grows; and older versions of the views and controllers can still be used as long as a common interface is maintained.
6) Distributable: With a couple of proxies one can easily distribute any MVC application by only altering the startup method of the application.yura
- Dec 2nd, 2015
Everyone explained what is MVC... This is outcome of one more design pattern called "separation of concerns", which means a "view" should only handle rendering logic of the model and should not be co...
Anil Nivargi
- Jun 26th, 2014
The MVC consists of three kinds of Objects i.e Model,View and Controller. Lets start explaining one by one. 1) Model- It handles data processing and database works part. Model processes event...
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Why java is not 100% object oriented language??
i have not ..asked in TCS interview ..if any one have plz answer me on er.anuj.mittal@gmail.com
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Exception Handling
What is the output of the following program, When tested under JDK 5.0class ExceptionDemo{ public static void main(String[] args) { int a[] = new int[] {1,2,3,4,5}; try{ System.out.prinltln(a[6]); } catch(Exception e) { System.out.println("Catching Exception ..."); } catch(ArrayIndexOutofBoundsException ae) { System.out.println("Catching ArrayIndexOutOfBounds...
kuchipudi Prasad
- May 31st, 2012
Output is "catching exception"
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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 are the differences between ArrayList and a Vector
YUVARAJ
- May 11th, 2012
Array is a set of related data type and static whereas vector is a grow able array of objects and dynamic
sampra
- Mar 13th, 2012
AL-non legecy/methods are not sysnchronized
Vector-legecy/method are synchronized -
Is java a fully object oriented programming or not? if not why?
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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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String s2="xyz";
String s3=new String("abcd");
totally how many objects will be created?
">In the declaration of strings, String s1="abc"; String s2="xyz"; String s3=new String("abcd");totally how many objects will be created?
nik7i
- Aug 28th, 2011
There are 3 objects created
According to syntax
string s1= new string("abcd")
syntax create an object of string
hence there are 3 object -
Output of Java Program
What is the output of the following program?class A{ public static void main(String[] s) { System.out.println(s[1] + s[2] + s[3]);}}java A 12345Options(i) 1(ii) 12(iii)1234(iv)234(v) Compilation Error
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abuthahir.d- Member Since Jan-2008 | Apr 14th, 2008
Khadar , i tried this code . it gives that exception
for the foll reason :
when u give a CLA(command line argument) , it will be inserted in the index 0 of the array and then will proceed to 1 ,2 ....
so as per the question , "12345" will be at s[0] . and length of that aray will be 1when u try to access s[1] , we are trying for 2nd element which is unavailable.....
Hope this answers u :-)shyamasundar
- Jun 2nd, 2018
(v) Compilation Error
shani
- Mar 14th, 2018
(v) Compilation Error
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Can we override the main method?
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ashish_setia- Member Since Oct-2006 | Oct 3rd, 2006
check out this example
class Checkmain{
public static void main(String args[]){
args[1]="ashish";
System.out.println("hello ");
}
}
class Checkmain1 extends Checkmain{
public static void main(String args[]){
System.out.println("how r u");
}}
class Jo{
public static void main(String args[]){
String S[]=new String[10] ;Checkmain.main(S);
Checkmain1.main(S);
}}vivek
- Aug 26th, 2017
Yes you can only do that by overriding main method signature for eg main(String[] args) to main(). Certainly there are no other ways to do that because JVM needs strings array arguments to take comma...
Dharmendra Singh
- Sep 15th, 2016
yes we can"java public class HelloWorld { // arguments are passed using the text field below this editor public static void main(String[] args) { String []s =new Str...
Core Java Interview Questions
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