object oriented programming questions and answers pdf

Object Oriented Programming Questions And Answers Pdf

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The elements of OOP will be explained in details and demonstrated in various parts of this tutorial.

OOP Interview Questions

Following are frequently asked Interview Questions for freshers as well as an experienced. OOPS is abbreviated as Object Oriented Programming system in which programs are considered as a collection of objects. Each object is nothing but an instance of a class. A class is simply a representation of a type of object. Encapsulation is an attribute of an object, and it contains all data which is hidden. That hidden data can be restricted to the members of that class. Polymorphism is nothing but assigning behavior or value in a subclass to something that was already declared in the main class.

Simply, polymorphism takes more than one form. Inheritance is a concept where one class shares the structure and behavior defined in another class. If Inheritance applied to one class is called Single Inheritance, and if it depends on multiple classes, then it is called multiple Inheritance.

Examples are endl and setw. A constructor is a method used to initialize the state of an object, and it gets invoked at the time of object creation. Rules for constructor are:. A destructor is a method which is automatically called when the object is made of scope or destroyed. Destructor name is also same as class name but with the tilde symbol before the name.

An inline function is a technique used by the compilers and instructs to insert complete body of the function wherever that function is used in the program source code. A virtual function is a member function of a class, and its functionality can be overridden in its derived class. This function can be implemented by using a keyword called virtual, and it can be given during function declaration.

A friend function is a friend of a class that is allowed to access to Public, private, or protected data in that same class. If the function is defined outside the class cannot access such information.

A friend can be declared anywhere in the class declaration, and it cannot be affected by access control keywords like private, public, or protected.

Function overloading is a regular function, but it can perform different tasks. It allows the creation of several methods with the same name which differ from each other by the type of input and output of the function.

Operator overloading is a function where different operators are applied and depends on the arguments. An abstract class is a class which cannot be instantiated. Creation of an object is not possible with an abstract class, but it can be inherited.

An abstract class can contain only an Abstract method. Java allows only abstract method in abstract class while other languages allow non-abstract method as well. The ternary operator is said to be an operator which takes three arguments. Arguments and results are of different data types, and it depends on the function. The ternary operator is also called a conditional operator. Finalize method helps to perform cleanup operations on the resources which are not currently used. Finalize method is protected, and it is accessible only through this class or by a derived class.

A parameter is a variable used during the declaration of the function or subroutine, and arguments are passed to the function body, and it should match with the parameter defined. There are two types of Arguments. The super keyword is used to invoke the overridden method, which overrides one of its superclass methods. This keyword allows to access overridden methods and also to access hidden members of the superclass.

Method overriding is a feature that allows a subclass to provide the implementation of a method that overrides in the main class.

It will override the implementation in the superclass by providing the same method name, same parameter, and same return type. An interface is a collection of an abstract method. If the class implements an interface, it thereby inherits all the abstract methods of an interface. An exception is an event that occurs during the execution of a program. Exceptions can be of any type — Runtime exception, Error exceptions.

Those exceptions are adequately handled through exception handling mechanism like try, catch, and throw keywords. A compiler recognizes a token, and it cannot be broken down into component elements. Keywords, identifiers, constants, string literals, and operators are examples of tokens. Even punctuation characters are also considered as tokens.

Example: Brackets, Commas, Braces, and Parentheses. Overloading is static Binding, whereas Overriding is dynamic Binding. Overloading is nothing but the same method with different arguments, and it may or may not return the equal value in the same class itself. Overriding is the same method names with the same arguments and return types associated with the class and its child class. An object is an instance of a class. Definition of properties and functions can be done in class and can be used by the object.

Abstraction is a useful feature of OOPS, and it shows only the necessary details to the client of an object. Meaning, it shows only required details for an object, not the inner constructors, of an object.

Whatever is required to switch on TV will be shown by using an abstract class. Access modifiers determine the scope of the method or variables that can be accessed from other various objects or classes. There are five types of access modifiers, and they are as follows:. Sealed modifiers are the access modifiers where the methods can not inherit it. Sealed modifiers can also be applied to properties, events, and methods. This modifier cannot be used to static members. Yes, it is possible to call the base method without creating an instance.

The new modifier instructs the compiler to use the new implementation instead of the base class function. Whereas, Override modifier helps to override the base class function. Create a new instance of a class and also passing arguments simultaneously. Early binding refers to the assignment of values to variables during design time, whereas late Binding refers to the assignment of values to variables during run time.

THIS pointer refers to the current object of a class. THIS keyword is used as a pointer which differentiates between the current object with the global object. It refers to the current object. The default access type of a Structure is public, but class access type is private. A structure is used for grouping data, whereas a class can be used for grouping data and methods. The default access modifier of a class is Internal and the default access modifier of a class member is Private.

A pure virtual function is a function which can be overridden in the derived class but cannot be defined. Dynamic or Run time polymorphism is also known as method overriding in which call to an overridden function is resolved during run time, not at the compile time. It means having two or more methods with the same name, same signature but with different implementation. This is a special constructor for creating a new object as a copy of an existing object.

There will always be only one copy constructor that can be either defined by the user or the system. Binding is nothing but the association of a name with the class. Static Binding is a binding in which name can be associated with the class during compilation time, and it is also called as early Binding.

Dynamic Binding is a binding in which name can be associated with the class during execution time, and it is also called as Late Binding. Zero instances will be created for an abstract class. In other words, you cannot create an instance of an Abstract Class. Question no 16 has wrong answer. An abstract class can aslo contain non — Abstract method.

An abstract class can have both Abstract and non-abstract methods.. Minimum one abstract method is compulsory.. Minimum one abstract method is compulsory — It is wrong.. We can create a abstract class without any abstract methods in it just make sure it is not instantiated. The answer to last question no. Abstraction is wrong. It should be Encapsulation instead. Data hiding refers to encapsulation not abstraction.

Abstraction is a way of designing the code. Abstraction is the correct answer. Although encapsulation hides data from the rest of the program, the question is not about that. The question no 4, can you check answer once, please. Feel that the sentences formation need to be corrected. Question no. An abstract class can contain only Abstract method.

Top 30 OOP Concept Interview Questions Answers in Java - Object Oriented Programming

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questions and answers for object-oriented programming (OOP) in C++ - Computer Science Format: PDF – for PC, Kindle, tablet, mobile.


Object Oriented Programming (Interview Questions & Answers)

Following are frequently asked Interview Questions for freshers as well as an experienced. OOPS is abbreviated as Object Oriented Programming system in which programs are considered as a collection of objects. Each object is nothing but an instance of a class. A class is simply a representation of a type of object.

What is Object? What is Encapsulation? Encapsulation is a process of binding the data members and member functions into a single unit. What is Abstraction? What are Access Specifiers?

Thanks, glad to hear that you like this list of Java Object Oriented Programming question.

Object-Oriented Programming - .NET Interview Questions and Answers

Use for non-commercial purpose. The term object-oriented programming was originally coined by Xerox PARC to designate a computer application that describes the methodology of using objects as the foundation for computation. OOP is widely accepted as being far more flexible than other computer programming languages. OOPs use three basic concepts as the fundamentals for the programming language: classes, objects and methods. OOP is a method of programming in which programs are organized as cooperative collections objects.

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.


This way of systematic learning will prepare anyone easily towards Object Oriented Programming interviews, online tests, examinations and certifications.


 Но это же абсурд, - не согласилась Сьюзан.  - Ни один из новых шифрованных файлов нельзя вскрыть без ТРАНСТЕКСТА. Вероятно, Цифровая крепость - это стандартный алгоритм для общего пользования, тем не менее эти компании не смогут его вскрыть. - Это блистательная рекламная операция, - сказал Стратмор.

КОЛИЧЕСТВО ДЕШИФРОВОК О Мидж постучала пальцем по этой цифре. - Я так и думала. Деление на ноль. Бринкерхофф высоко поднял брови. - Выходит, все в порядке.

Чатрукьян знал: как только Джабба узнает, что Стратмор обошел фильтры, разразится скандал. Какая разница? - подумал.  - Я должен выполнять свои обязанности.

 Вот как? - снисходительно произнес Стратмор холодным как лед голосом.  - Значит, тебе известно про Цифровую крепость. А я-то думал, что ты будешь это отрицать. - Подите к черту. - Очень остроумно.

Затем он быстро побежит в заднюю часть собора, словно бы за помощью, и в возникшей неразберихе исчезнет прежде, чем люди поймут, что произошло. Пять человек. Четверо. Всего трое. Халохот стиснул револьвер в руке, не вынимая из кармана.

У Бринкерхоффа подогнулись колени. Он не мог понять, почему Мидж всегда права. Он не заметил отражения, мелькнувшего за оконным стеклом рядом с. Крупная фигура возникла в дверях директорского кабинета. - Иису… - Слова застряли у Бринкерхоффа в глотке.

40 Advanced OOP Interview Questions and Answers [2019 Update]

Велел ему сегодня не приходить. Он ничего не сказал о том, что поменялся с тобой дежурством. У Чатрукьяна ком застрял в горле.

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