OOPS Common Interview Questions and Answers

1. What is the difference between procedural and object-oriented programs?- a) In procedural program, programming logic follows certain procedures and the instructions are executed one after another. In OOP program, unit of program is object, which is nothing but combination of data and code. b) In procedural program, data is exposed to the whole program whereas in OOPs program, it is accessible with in the object and which in turn assures the security of the code.
2. What are Encapsulation, Inheritance and Polymorphism?- Encapsulation is the mechanism that binds together code and data it manipulates and keeps both safe from outside interference and misuse. Inheritance is the process by which one object acquires the properties of another object. Polymorphism is the feature that allows one interface to be used for general class actions.
3. What is the difference between Assignment and Initialization?- Assignment can be done as many times as desired whereas initialization can be done only once.
4. What is OOPs?- Object oriented programming organizes a program around its data, i. e. , objects and a set of well defined interfaces to that data. An object-oriented program can be characterized as data controlling access to code.
5. What are Class, Constructor and Primitive data types?- Class is a template for multiple objects with similar features and it is a blue print for objects. It defines a type of object according to the data the object can hold and the operations the object can perform. Constructor is a special kind of method that determines how an object is initialized when created. Primitive data types are 8 types and they are: byte, short, int, long, float, double, boolean, char.
6. What is an Object and how do you allocate memory to it?- Object is an instance of a class and it is a software unit that combines a structured set of data with a set of operations for inspecting and manipulating that data. When an object is created using new operator, memory is allocated to it.
7. What is the difference between constructor and method?- Constructor will be automatically invoked when an object is created whereas method has to be called explicitly.
8. What are methods and how are they defined?- Methods are functions that operate on instances of classes in which they are defined. Objects can communicate with each other using methods and can call methods in other classes. Method definition has four parts. They are name of the method, type of object or primitive type the method returns, a list of parameters and the body of the method. A method’s signature is a combination of the first three parts mentioned above.
9. How many ways can an argument be passed to a subroutine and explain them?- An argument can be passed in two ways. They are passing by value and passing by reference. Passing by value: This method copies the value of an argument into the formal parameter of the subroutine. Passing by reference: In this method, a reference to an argument (not the value of the argument) is passed to the parameter.
10. What is the difference between an argument and a parameter?- While defining method, variables passed in the method are called parameters. While using those methods, values passed to those variables are called arguments.
11. What are different types of access modifiers?- public: Any thing declared as public can be accessed from anywhere. private: Any thing declared as private can’t be seen outside of its class. protected: Any thing declared as protected can be accessed by classes in the same package and subclasses in the other packages. default modifier : Can be accessed only to classes in the same package.
12. What are Transient and Volatile Modifiers?- Transient: The transient modifier applies to variables only and it is not stored as part of its object’s Persistent state. Transient variables are not serialized. Volatile: Volatile modifier applies to variables only and it tells the compiler that the variable modified by volatile can be changed unexpectedly by other parts of the program.
13. What is method overloading and method overriding?- Method overloading: When a method in a class having the same method name with different arguments is said to be method overloading. Method overriding : When a method in a class having the same method name with same arguments is said to be method overriding.
14. What is difference between overloading and overriding?- a) In overloading, there is a relationship between methods available in the same class whereas in overriding, there is relationship between a superclass method and subclass method. b) Overloading does not block inheritance from the superclass whereas overriding blocks inheritance from the superclass. c) In overloading, separate methods share the same name whereas in overriding, subclass method replaces the superclass. d) Overloading must have different method signatures whereas overriding must have same signature.
15. What is meant by Inheritance and what are its advantages?- Inheritance is the process of inheriting all the features from a class. The advantages of inheritance are reusability of code and accessibility of variables and methods of the super class by subclasses.
16. What is the difference between this() and super()?- this() can be used to invoke a constructor of the same class whereas super() can be used to invoke a super class constructor.
17. What is the difference between superclass and subclass?- A super class is a class that is inherited whereas sub class is a class that does the inheriting.
18. What modifiers may be used with top-level class?- public, abstract and final can be used for top-level class.
19. What are inner class and anonymous class?- Inner class : classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private. Anonymous class : Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
20. What is interface and its use?- Interface is similar to a class which may contain method’s signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for: a)Declaring methods that one or more classes are expected to implement b)Capturing similarities between unrelated classes without forcing a class relationship. c)Determining an object’s programming interface without revealing the actual body of the class.
21. What is an abstract class?- An abstract class is a class designed with implementation gaps for subclasses to fill in and is deliberately incomplete.
22. What is the difference between abstract class and interface?- a) All the methods declared inside an interface are abstract whereas abstract class must have at least one abstract method and others may be concrete or abstract. b) In abstract class, key word abstract must be used for the methods whereas interface we need not use that keyword for the methods. c) Abstract class must have subclasses whereas interface can’t have subclasses.
23. Can you have an inner class inside a method and what variables can you access?- Yes, we can have an inner class inside a method and final variables can be accessed.
24. What is the difference between Array and vector?- Array is a set of related data type and static whereas vector is a growable array of objects and dynamic.
25. What is the difference between exception and error?- The exception class defines mild error conditions that your program encounters. Exceptions can occur when trying to open the file, which does not exist, the network connection is disrupted, operands being manipulated are out of prescribed ranges, the class file you are interested in loading is missing. The error class defines serious error conditions that you should not attempt to recover from. In most cases it is advisable to let the program terminate when such an error is encountered.
26. What is the difference between process and thread?- Process is a program in execution whereas thread is a separate path of execution in a program.
27. What is multithreading and what are the methods for inter-thread communication and what is the class in which these methods are defined?- Multithreading is the mechanism in which more than one thread run independent of each other within the process. wait (), notify () and notifyAll() methods can be used for inter-thread communication and these methods are in Object class. wait() : When a thread executes a call to wait() method, it surrenders the object lock and enters into a waiting state. notify() or notifyAll() : To remove a thread from the waiting state, some other thread must make a call to notify() or notifyAll() method on the same object.

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JAVA Common Interview Questions and Answers

What is the difference between procedural and object-oriented programs?- a) In procedural program, programming logic follows certain procedures and the instructions are executed one after another. In OOP program, unit of program is object, which is nothing but combination of data and code. b) In procedural program, data is exposed to the whole program whereas in OOPs program, it is accessible with in the object and which in turn assures the security of the code.

What is the difference between Assignment and Initialization?- Assignment can be done as many times as desired whereas initialization can be done only once.

What is the difference between constructor and method?- Constructor will be automatically invoked when an object is created whereas method has to be called explicitly.

What is the difference between an argument and a parameter?- While defining method, variables passed in the method are called parameters. While using those methods, values passed to those variables are called arguments.

What is the difference between overloading and overriding?- a) In overloading, there is a relationship between methods available in the same class whereas in overriding, there is relationship between a superclass method and subclass method. b) Overloading does not block inheritance from the superclass whereas overriding blocks inheritance from the superclass. c) In overloading, separate methods share the same name whereas in overriding, subclass method replaces the superclass. d) Overloading must have different method signatures whereas overriding must have same signature.

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What is the difference between this() and super()?- this() can be used to invoke a constructor of the same class whereas super() can be used to invoke a super class constructor.

FRESHER OFF-CAMPUS & MEGA JOB FAIRS - 2011

What is the difference between superclass and subclass?- A super class is a class that is inherited whereas sub class is a class that does the inheriting.

What is the difference between String and String Buffer?- a) String objects are constants and immutable whereas StringBuffer objects are not. b) String class supports constant strings whereas StringBuffer class supports growable and modifiable strings.

What is the difference between Array and vector?- Array is a set of related data type and static whereas vector is a growable array of objects and dynamic.

What is the difference between exception and error?- The exception class defines mild error conditions that your program encounters. Exceptions can occur when trying to open the file, which does not exist, the network connection is disrupted, operands being manipulated are out of prescribed ranges, the class file you are interested in loading is missing. The error class defines serious error conditions that you should not attempt to recover from. In most cases it is advisable to let the program terminate when such an error is encountered.

What is the difference between process and thread?- Process is a program in execution whereas thread is a separate path of execution in a program.

What is the difference between abstract class and interface?- a) All the methods declared inside an interface are abstract whereas abstract class must have at least one abstract method and others may be concrete or abstract. b) In abstract class, key word abstract must be used for the methods whereas interface we need not use that keyword for the methods. c) Abstract class must have subclasses whereas interface can’t have subclasses.

What is the difference between Integer and int?- a) Integer is a class defined in the java. lang package, whereas int is a primitive data type defined in the Java language itself. Java does not automatically convert from one to the other. b) Integer can be used as an argument for a method that requires an object, whereas int can be used for calculations.

What is the difference between choice and list?- A Choice is displayed in a compact form that requires you to pull it down to see the list of available choices and only one item may be selected from a choice. A List may be displayed in such a way that several list items are visible and it supports the selection of one or more list items.

What is the difference between scrollbar and scrollpane?- A Scrollbar is a Component, but not a Container whereas Scrollpane is a Conatiner and handles its own events and perform its own scrolling.

What is the difference between applications and applets?- a)Application must be run on local machine whereas applet needs no explicit installation on local machine. b)Application must be run explicitly within a java-compatible virtual machine whereas applet loads and runs itself automatically in a java-enabled browser. d)Application starts execution with its main method whereas applet starts execution with its init method. e)Application can run with or without graphical user interface whereas applet must run within a graphical user interface.

What is the difference between set and list?- Set stores elements in an unordered way but does not contain duplicate elements, whereas list stores elements in an ordered way but may contain duplicate elements.

What is the difference between an applet and a servlet?- a) Servlets are to servers what applets are to browsers. b) Applets must have graphical user interfaces whereas servlets have no graphical user interfaces.

What is the difference between doPost and doGet methods?- a) doGet() method is used to get information, while doPost() method is used for posting information. b) doGet() requests can’t send large amount of information and is limited to 240-255 characters. However, doPost()requests passes all of its data, of unlimited length. c) A doGet() request is appended to the request URL in a query string and this allows the exchange is visible to the client, whereas a doPost() request passes directly over the socket connection as part of its HTTP request body and the exchange are invisible to the client.

What is the difference between TCP/IP and UDP?- TCP/IP is a two-way communication between the client and the server and it is a reliable and there is a confirmation regarding reaching the message to the destination. It is like a phone call. UDP is a one-way communication only between the client and the server and it is not a reliable and there is no confirmation regarding reaching the message to the destination. It is like a postal mail.

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Walkin for Java Freshers in Chennai - 2011 Freshers Walkin - Jobs for Software Freshers in Chennai

Spiro Solutions Recruiting Fresher Java Developer

Experience: 0 Years
Location: Chennai
Education: B.E/B.Tech/BCA/MCA/B.Sc/M.SC
Functional Area: Application Programming, Maintenance

Job Description :
Working as a Java Developer

Desired Candidate Profile ;
2011 passout Candidates, 
should have basic knowledge of Core Java, EJB. With good communication skills, Innovate bent of mind, Analytical and Problem solving skills. Candidates should being with chennai.

Contact Details :
Company Name: SPIRO SOLUTIONS PVT LTD
Website: http://www.spiroit.com
Executive Name: Ms.M.Eshwari

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Fresher / Walkin jobs- Designation in All Over India July 2011

resher / Walkin jobs- Designation		Company	Qualification	Location
Urgent Requirement for Customer Service Associati...		SDS Infocervices	12 or gradu..	kolkata
Project Executive-MBA Freshers		Web Development Co..	MBA Fresher	Chennai
Jr. Linux System Administrator		Solution Enterprises	Graduate	Mumbai, Pune
WebTech Developers providing free industrial train...		WebTech Developers	MSc / MCA	Pune
Work at home / Part time job / Home based job		vegainfoservice	student	india
Software Engineer		Phlox Technologies	B-tech,MCA,..	Hyderabad,chennai,Bangalore
Inbound Customer service, blended, Technical, Outb...		Vanquish Infosys	UG/Graduate	Noida
Customer Care Executive		Viraj Management C..	Any Graduat..	Indore, Mumbai, Bangalore
institute for trainig telecom engineer		tech vidhya ( a un..	any graduat..	mumbai
Associate Software Developers		WebTech Developers	Fresher	Pune
Recruitment Consultant/Executive		ACH Management Con..	Any Graduate	Mumbai
SEO Professional		ISOL Systems Pvt. ..	Graduate/po..	Bikaner
English Translators		Prime Focus	X	Bangalore
Front Office & Food & Beverage Services		Sidhi Infotech	10+2	Bangalore
Need Software developer(JAVA/.NET)&Web designers-f...		Immanuel IT Solutions	B.Sc. Compu..	Chennai
Walk-in Joomla Developers with 1+years of Experien...		Make eIT Solutions..	Any Degree	Chennai
Female Field Cousellor		Dos Computer Insti..	HSC	Badlapur -w
Junior Executive - Online Marketing		Dumadu Games	BBM, BA, BC..	Bangalore
Tellecalling/Sales & Marketing		Covenant Infosyste..	Any Graduat..	Faridabad
Software Programmer		tradeiq	BE/B.Tech/MCA	Bangalore
WALK IN INTERVIEWS FOR FRESHERS ON SATURDAY 16th J...		Techgene Solutions	MBA or Any ..	Hyderabad
Software Programmer		Agogue Consultancy..	BE/BTech/MCA	Pune
Opening for .Net Programmers		Smabes Solutions	BSC, BCA, B..	India
Assistant Faculty		Bharath Infotech	BSc (Comput..	Chennai
PHP Programmer-6 months exp		IS0-9001-9002 Cert..	Graduate	Chennai
Programmer (.Net)		Apparent Infotech	BCA/MCA/B.S..	Chennai
Urgent Requirement for Software trainers/Engineers...		Immanuel IT Solutions	Any graduate	Chennai
Lead Generation for United States		Sunchaser Technolo..	Under gradu..	India
Opening for Dot Net freshers		i4Technology Solut..	Bsc, BE/B.T..	Chennai
Business Support-MBA Fresher		US Based Software ..	MBA/BBA Fre..	Chennai
Freshers Needed From 2010/2011 batch		Texsas Technologies	B.E/b.tech,..	Chennai, Mumbai, Bangalor..
Opening in Leading International BPO		Opening in Leading..	HSC and Gra..	Mumbai
Job assured Training For ECE /EEE/Electronics/ Fre...		Learn Bench	BE/BTECH	Chennai
Openings in Bioinformatics		Alcove LifeSciences	PG in Bioin..	Hyderabad
Subject Matter Expert/Author for Chemistry and Maths		Target Publixcatio..	Any Graduat..	Mulund-East, Mumbai
Programmer		Apparent Infotech	BCA/MCA/B.S..	Chennai
Fresher-Engineer Trainee-ITIS		ARICH Infotech Pvt..	BE/BTech/MC..	Pune,Chennai
US- IT Recruitment		Miracle Software S..	Any Degree ..	Visakhapatnam
Electrical and electronics fresher			B.E-Electri..	Bangalore, Mumbai
Front Office-Fresher		Software Company	Graduate	Chennai
Business Development Manager		ICON ART DECO	Graduate	Mumbai
IT Recruiter		Vdart	B.SC,Any De..	Bangalore, Chennai ,Trichy
Trainee - Business Analyst		SynapseIndia	BE/B.TEch/M..	Noida
Customer Care Executive		ICM SOLUTIONS PVT LTD	Graduation ..	Chennai
Embedded engineer Training cum placement		Learn bench	BE/BTECH	Chennai
Accounts Executive (Female Only)		Power Vision	B.Com,M.Com..	Pune
Instructional designers		Azpire Consultancy..	Any Graduat..	chennai
Busines Development Executive		Client of Sanvels ..	MBA/B.E	Chennai
Technial Support dotnet (General Timings)		Payment Gateway Co..	Graduate	Chennai
Indoor Marketing		Susean Infosolutions	PUC, 2nd PU..	Bangalore
Associate Software Engineer		Accenture	B.Tech / BE..	Bangalore, Chennai, Pune,..
BUSINESS DEVELOPEMENT ASSOCIATES		NDOT Private limited	MBA	Coimbatore
Field technicans ( FTs), Tech Support Exec (TSE )		AIS- Vellore	B.A/B.com/B..	vellore
Junior Processor (Banking Backend Operations)		Leading Bank	Graduate	Chennai
Merchandizer		Echidna Software P..	BA/BSc/BCom..	Bangalore
Job fair		WOLKSWIRE BUISNESS..	btech	AGRA
PHP Software Engineer - Trainee		Enigma Solutions P..	BE/B.Tech/M..	Trivandrum, Kerala
Branch Banking / Back Office / Client Services Off...		AIIM EduSys Pvt Ltd	Graduate (a..	Mumbai, Nasik
AIRINE JOBS (CABIN CREW) JOB CONTACT (09256002777)...		MNCS	12TH	12TH
Marketing		K-VAN Solutions Pr..	MBA, or any..	Hyderabad, Madhya Pradesh
Business development Executive		weshine	BBA MBA mar..	mumbai
sales		pacecon technosys ..	diploma	mumbai
HR EXECUTIVE		MOBHERO	MBA	Bangalore
Marketing Job in HDFC bank in Noida			BBA	Noida
Game developer		SchoolCountry	Anything	Jaipur
Graphic artist / designer		School Country	Graduate in..	Jaipur
Solaris System Administrator(L1)		Indmax IT Services..	B.Tech - CS..	Guntur, Vijayawada, Hyder..
Web Developer - Fresher		Vigna Technologies..	Students fr..	Chennai
VLSI Design Engineers Vacancy		Embedded Technolog..	BE/BTech El..	Mumbai
Embedded Software Ehgineers Vacancy		Embedded Technolog..	BE/BTech El..	Mumbai
software programmer		GTT pvt Ltd	BE/BTECH/Ms..	CHENNAI
job in insurance		B Pharma 6 months ..	B Pharma	ahemadabad
Software Programmer		Esjaysys Software ..	BE/B.Tech/MCA	Chennai
(FRESHERS + EXPERIENCED) Software Developer		Esjaysys Software ..	BE/B.Tech/MCA	chennai
Field technicans ( FTs), Tech Support Exec (TSE )		Ambalal Infinity S..	B..C.A, B.S..	Vellore

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Job List

Job List	Job Date
Mega Off-Campus Drive for Freshers at TIBCO Software India Pvt Ltd	7/16/2011
ASP.Net 3.0 /3.5, C# programming Recruitment Drive at Synechron On 23 & 24 July 2011	7/24/2011
Jobs for Fresher - Huge Walk-in Drive at CSS Corp On 9th July 2011	7/9/2011
Mega Job Fair for Freshers at Shardha Group of Institutions On 9th & 10th July 2011	7/10/2011
Fresher Walk-in Drive at iGATE Patni for Trainee Associate/ Associate - 2009/2010/2011 Batch	7/9/2011
WeP Peripherals Off-Campus for Fresher Software Design Engineer On 2nd July 2011	7/2/2011
CISCO Systems Walk-in Drive for BE/B.Tech/MCA/ME/M.Tech - 2009/2010 Batch	7/2/2011
Freshers Off-Campus at Sankalp Semiconductor for 2010 / 2011 Passout	7/2/2011
iGATE Fresher Off-Campus for 2009, 2010 or 2011 Graduates	6/25/2011
HCL Off-Campus: Fresher Walk-in Interview On 25th June 2011	6/25/2011
Freshers Walk-in Drive at SAI Systems International, Inc. (0-1 Year Exp)	6/23/2011
Muti-Industry IT JOB FAIR for Syntel, Amazon, IT Plexus, Prodigy Solution On 18th & 19th Jun, 2011	6/19/2011
Freshers OFF-CAMPUS at Nucleus Software - BE/B.Tech/MCA/ME/M.Sc 2011 Passout	6/27/2011
MEGA Off-Campus: IBM Freshers for BE / B.Tech / MCA / Any Graduate - 2009/2010/2011 Passout	6/26/2011
JP Morgan Chase Walk-in Drive for Freshers On 8th and 10th June 2011	6/10/2011
Mega Walkin Drive for Fresher at Spider India for MBA	6/5/2011
IBM Women Special Hiring Drive - Mulitiple Vacancies On 5 June 2011	6/5/2011
MEGA Walk-in Drive: Cisco Systems for Freshers BE/ME/MTech/MCA	6/5/2011
Mega Walkin Drive for Java J2EE Professionals at FSS On 21st May	5/21/2011
Cognizant Combined Campus Freshers Recruitment Drive - 2010/2011 Passout	5/30/2011
Capgemini Walk-in Interview Drive On 14 May 2011 (1 - 6 Years Exp)	5/14/2011
Capgemini Walk-in Interview Drive On 14 May 2011 (1 - 6 Years Exp)	4/14/2011
Freshers 2011 Campus Recruitment at HUAWEI Technology - BE, BTech	5/28/2011
Multiple Job Vacancies at Ministry of Home Affairs - 20 June 2011	6/27/2011
UST International Scheduled Weekend Drive for C,C++, Unix	5/15/2011

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JB Software Pvt Ltd (www.jbsoftindia.com) Walk-In for Dot Net Professionals, Chennai

JB Software Pvt Ltd (www.jbsoftindia.com) Walk-In for Dot Net Professionals, Chennai

J&B Software India is a premier software product development and project implementation house, providing high-end payment system solutions, primarily targeting Banking and Financial Services. J&B Software India is a wholly owned subsidiary of J&B Software, Inc.

J&B Software, Inc., established in 1984 and headquartered in a sprawling campus in Blue Bell, Pennsylvania, USA, is a premier provider of enterprise wide transaction & payment systems solutions and integration services, for multi-channel processors. J&B Software Inc. markets and implements its solutions primarily across North America.

J&B Software delivers market-leading automated payments and transaction processing and management systems to over 165 organizations, including regional and money-center banks, insurance companies and mutual funds, credit card and student loan processors, telecom, utilities, government

Interview Location: Chennai

J&B Software India Pvt Ltd,
6th Floor, Tower1, Rayala Towers, 158,
Mt. Road, Chennai - 600 002
Tel: 91 44 28411342 EXT : 206

We have an immediate opening for :
Dot Net Professionals(Asp.Net/C#.Net,VB.Net) Professionals with knowledge on webservices and remoting
Exp:5-7 yrs of relevant experience
Excellent communication skills
Job Location : Chennai
Salary is not a constraint for the right candidate.

Contact Details: Nithya, Human Resources

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Dot Net Freshers Walkin in Chennai

Ada India Pvt Ltd

Job Requirements

Industry:	Computers / IT
Education:	Any Graduate - Any PG Course
Location:	Chennai
Experience:	0 Years
Posted Date:	Friday, February 04, 2011

Job Description

Fresher Education : Graduate Freshers passedout from 2008/2009/2010
Skillset : Good knowledge in Asp.net/C#/SQL

Interview Timings : Candidates can walk in between 11.30am to 4pm (Monday to Friday)

Desired Candidate Profile

Education : Graduate Freshers passedout from 2008/2009/2010
Skillset : Good knowledge in Asp.net/C#/SQL

Company Profile

Ada India pvt Ltd,establised in year 2000,serving clients across norway & spain looking out for ,Dot Net Freshers,

Contact Details

jobs@adaindia.net

Company Name:	Ada India Pvt Ltd
Web Site:	Not Mentioned
Email Address:	jobsadaindia.net
Reference Code:	Not Mentioned
Telephone:	Not Mentioned
Apply URL:	Not Mentioned

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