Object Oriented Programming Interview Questions And Answers Pdf

object oriented programming interview questions and answers pdf

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It refers to the languages which are using objects in programming. The objective of OOPS is to carry out practical entities such as hiding, abstraction, polymorphism, and more into coding. If you are new to OOPS or want to improve your skills.

Following are frequently asked Interview Questions for freshers as well as an experienced.

Oops is a concept or methodology which is use to write computer programes by using class and object. Oops stands for object oriented programming its a example of programming language which deals with, object and its interaction to develop computer Applications and program. Object Oriented Programming System is a mechanism to write a computer program by using class and Object. The Object Oriented Programming System is providing 4 principles like 1. Encapsulation 2.

OOPS interview questions and Answers

OOP is, by far, the most common programming paradigm used in the IT industry. All the major programming languages now support OOP including C. OOP reflects the real world behavior of how things work and the most efficient way to model and organize very large applications. Inheritance allows us to define a class in terms of another class, which makes it easier to create and maintain an application. This also provides an opportunity to reuse the code functionality and speeds up implementation time.

When creating a class, instead of writing completely new data members and member functions, the programmer can designate that the new class should inherit the members of an existing class. This existing class is called the base class, and the new class is referred to as the derived class. The idea of inheritance implements the IS-A relationship.

OOP is a technique to develop logical modules, such as classes that contain properties, methods, fields, and events. An object is created in the program to represent a class.

Therefore, an object encapsulates all the features, such as data and behavior that are associated to a class. OOP allows developers to develop modular programs and assemble them as software.

Objects are used to access data and behaviors of different software modules, such as classes, namespaces, and sharable assemblies. Constructor is a special method of a class, which is called automatically when the instance of a class is created. It is created with the same name as the class and initializes all class members, whenever you access the class. The main features of a constructor are as follows:. Encapsulation is defined as the process of enclosing one or more items within a physical or logical package.

Encapsulation, in object oriented programming methodology, prevents access to implementation details. The word polymorphism means having many forms. In object-oriented programming paradigm, polymorphism is often expressed as one interface, multiple functions.

Procedural programming is based upon the modular approach in which the larger programs are broken into procedures. Each procedure is a set of instructions that are executed one after another. On the other hand, OOP is based upon objects. An object consists of various elements, such as methods and variables. Access modifiers are not used in procedural programming, which implies that the entire data can be accessed freely anywhere in the program.

In OOP, you can specify the scope of a particular data by using access modifiers - public , private , internal , protected , and protected internal. A class acts as a blue-print that defines the properties, states, and behaviors that are common to a number of objects.

An object is an instance of the class. For example, you have a class called Vehicle and Car is the object of that class.

You can create any number of objects for the class named Vehicle , such as Van , Truck , and Auto. The new operator is used to create an object of a class. When an object of a class is instantiated, the system allocates memory for every data member that is present in the class. The virtual keyword is used while defining a class to specify that the methods and the properties of that class can be overridden in derived classes.

All the methods inside an interface are always public , by default. You cannot specify any other access modifier for them.

An abstract class is a class that cannot be instantiated and is always used as a base class. The following are the characteristics of an abstract class:.

The basic purpose of an abstract class is to provide a common definition of the base class that multiple derived classes can share. Data encapsulation is a concept of binding data and code in single unit called object and hiding all the implementation details of a class from the user. It prevents unauthorized access of data and restricts the user to use the necessary data only. Polymorphism describes a pattern in object oriented programming in which classes have different functionality while sharing a common interface.

A real world analogy for polymorphism is a button. Everyone knows how to use a button: you simply apply pressure to it. If your boss tells you to press a button, you already have all the information needed to perform the task.

NET does not support multiple inheritance directly because in. NET, a class cannot inherit from more than one class. NET supports multiple inheritance through interfaces. NET languages supports single, hierarchical, and multilevel inheritance. They do not support multiple inheritance because in these languages, a derived class cannot have more than one base class.

However, you can implement multiple inheritance in. NET through interfaces. A destructor is a special method for a class and is invoked automatically when an object is finally destroyed. A destructor is used to free the dynamic allocated memory and release the resources. You can, however, implement a custom method that allows you to control object destruction by calling the destructor. In OOP we develop our code in modules. Each module has certain responsibilities. Cohesion shows how much module responsibilities are strongly related.

Higher cohesion is always preferred. Higher cohesion benefits are:. OOP Modules are dependent on each other. Coupling refers to level of dependency between two software modules. Two modules are highly dependent on each other if you have changed in one module and for supporting that change every time you have to change in dependent module. Loose Coupling is always preferred. Inversion of Control and dependency injections are some techniques for getting loose coupling in modules.

Static constructors are introduced with C to initialize the static data of a class. CLR calls the static constructor before the first instance is created. There are actually many good reasons to consider using accessors rather than directly exposing fields of a class - beyond just the argument of encapsulation and making future changes easier.

The classes in a namespace are internal , by default. However, you can explicitly declare them as public only and not as private , protected , or protected internal. The nested classes can be declared as private , protected , or protected internal. A function is a piece of code that is called by name.

It can be passed data to operate on i. All data that is passed to a function is explicitly passed. A method is a piece of code that is called by a name that is associated with an object. In most respects it is identical to a function except for two key differences:.

Polymorphism is the ability of a class instance to behave as if it were an instance of another class in its inheritance tree, most often one of its ancestor classes. For example, in. NET all classes inherit from Object. Therefore, you can create a variable of type Object and assign to it an instance of any class. An override is a type of function which occurs in a class which inherits from another class. An override function "replaces" a function inherited from the base class, but does so in such a way that it is called even when an instance of its class is pretending to be a different type through polymorphism.

Referring to the previous example, you could define your own class and override the toString function. Because this function is inherited from Object, it will still be available if you copy an instance of this class into an Object-type variable.

Normally, if you call toString on your class while it is pretending to be an Object, the version of toString which will actually fire is the one defined on Object itself. However, because the function is an override, the definition of toString from your class is used even when the class instance's true type is hidden behind polymorphism.

Overloading is the action of defining multiple methods with the same name, but with different parameters. It is unrelated to either overriding or polymorphism. A monad is an "amplifier" of types that obeys certain rules and which has certain operations provided.

First, what is an "amplifier of types"? By that I mean some system which lets you take a type and turn it into a more special type. This is an amplifier of types.

It lets you take a type, say int , and add a new capability to that type, namely, that now it can be null when it couldn't before. It is an amplifier of types. It lets you take a type, say, string , and add a new capability to that type, namely, that you can now make a sequence of strings out of any number of single strings.

Programming to an interface has absolutely nothing to do with abstract interfaces like we see in Java or. It isn't even an OOP concept. It means just interact with an object or system's public interface. Don't worry or even anticipate how it does what it does internally.

Don't worry about how it is implemented.

OOPS Interview Questions & Answers

Java object oriented programming questions are designed in such a way that it will help you understand OOPs concepts of the Java language. A child can have only one parent Multiple sub classes can inherit a same super class. More than pages of Programming interview questions and answers Asked in real interviews Object Oriented Programming oops principles interview questions and answers - Programming interview questions and answers. However, I will drop your 2 lowest quiz scores. The network has to maintain a relationship between the objects and some roles are assigned from time to time using a script.

In this section you can learn and practice interview questions based on "". IndiaBIX provides you lots of fully solved ". All students, freshers can download ". Solved examples with detailed answer description, explanation are given and it would be easy to understand. View the solution for the problems with feel and good user interface; easily go through all questions and answers.

OOPS stands for Object-oriented programming, is a programming pattern based on the idea of "objects", which may comprise data, in the form of fields, frequently known as attributes; and code, in the form of procedures, often identified as methods. Preparing for a job is now easier and simpler with our interview questions better on Wisdomjobs? Because Wisdomjobs give you all information plus all the jobs in one place. When you're interviewing for a new position, you should come prepared to answer the interview questions to win in first attempt. Having expertise in OOPS will place you an ideal career. Each object is nothing but an instance of a class.

Object-Oriented Programming - .NET Interview Questions and Answers

OOP is, by far, the most common programming paradigm used in the IT industry. All the major programming languages now support OOP including C. OOP reflects the real world behavior of how things work and the most efficient way to model and organize very large applications.

What is Object Oriented Programming? O bject O riented P rogramming OOP is a programming paradigm where the complete software operates as a bunch of objects talking to each other. An object is a collection of data and methods that operate on its data.

Object-Oriented Programming - .NET Interview Questions and Answers

Top 50 Important OOPs Interview Questions and Answers

 Табу Иуда. Самый великий панк со времен Злого Сида. Ровно год назад он разбил здесь себе голову. Сегодня годовщина. Беккер кивнул, плохо соображая, какая тут связь.

Джабба повернулся к монитору и вскинул руки.  - Почему среди нас нет ни одного ядерного физика. Сьюзан, глядя на мультимедийный клип, понимала, что все кончено. Она следила за смертью Танкадо - в который уже .

От этого кольца мне было не по. На девушке было много украшений, и я подумала, что ей это кольцо понравится. - А она не увидела в этом ничего странного. В том, что вы просто так отдали ей кольцо. - Нет. Я сказала, что нашла его в парке.

OOPS Related Tutorials

ГЛАВА 115 В голове Дэвида Беккера была бесконечная пустота. Я умер. Но я слышу какие-то звуки. Далекий голос… - Дэвид. Он почувствовал болезненное жжение в боку. Мое тело мне больше не принадлежит.

Говорили, что от него уходит жена, с которой он прожил лет тридцать. А в довершение всего - Цифровая крепость, величайшая опасность, нависшая над разведывательной службой. И со всем этим ему приходится справляться в одиночку. Стоит ли удивляться, что он находится на грани срыва?. - С учетом обстоятельств, я полагаю, - сказала Сьюзан, - вам все же нужно позвонить директору. Стратмор покачал головой, и капля пота с его лба упала на стол. - Я не хочу никоим образом нарушать покой директора и говорить с ним о кризисе, в то время как он не в состоянии предпринять хоть что-нибудь.

Не. ГЛАВА 65 Бринкерхофф мерил шагами кабинет Мидж Милкен. - Никому не позволено действовать в обход фильтров. - Ошибаешься, - возразила.  - Я только что говорила с Джаббой.

Человек неумолимо приближался по крутой дорожке. Вокруг Беккера не было ничего, кроме стен. По сторонам, правда, находились железные ворота, но звать на помощь уже поздно. Беккер прижался к стене спиной, внезапно ощутив все камушки под подошвами, все бугорки штукатурки на стене, впившиеся в спину.

40 Advanced OOP Interview Questions and Answers [2019 Update]

Ты выиграл. Чего ты от меня хочешь. Молчание. Хейл сразу же растерялся, не зная, как истолковать примирительный тон коммандера, и немного ослабил хватку на горле Сьюзан. - Н-ну, - заикаясь начал он, и голос его внезапно задрожал.

 - Что скажешь. А потом мы могли бы… - Выкинь это из головы. - Сколько в тебе снобизма.

 Я попросил его не звонить мне, пока он не найдет кольцо. - Почему? - удивилась Сьюзан.  - А если ему нужна помощь. Стратмор пожал плечами. - Отсюда я не в состоянии ему помочь - ему придется полагаться лишь на .