1) What is meant by Object Oriented Programming?
OOP is a method of programming in
which programs are organised as cooperative collections of objects. Each
object is an instance of a class and each class belong to a hierarchy.
2) What is a Class?
Class is a template for a set of objects that share a common structure and a common behaviour.
3) What is an Object?
Object is an instance of a class. It has state,behaviour and identity. It is also called as an instance of a class.
4) What is an Instance?
An instance has state, behaviour and
identity. The structure and behaviour of similar classes are defined in
their common class. An instance is also called as an object.
5) What are the core OOP’s concepts?
Abstraction, Encapsulation,Inheritance and Polymorphism are the core OOP’s concepts.
6) What is meant by abstraction?
Abstraction defines the essential
characteristics of an object that distinguish it from all other kinds of
objects. Abstraction provides crisply-defined conceptual boundaries
relative to the perspective of the viewer. Its the process of focussing
on the essential characteristics of an object. Abstraction is one of the
fundamental elements of the object model.
7) What is meant by Encapsulation?
Encapsulation is the process of
compartmentalising the elements of an abtraction that defines the
structure and behaviour. Encapsulation helps to separate the contractual
interface of an abstraction and implementation.
8) What is meant by Inheritance?
Inheritance is a relationship among
classes, wherein one class shares the structure or behaviour defined in
another class. This is called Single Inheritance. If a class shares the
structure or behaviour from multiple classes, then it is called Multiple
Inheritance. Inheritance defines “is-a” hierarchy among classes in
which one subclass inherits from one or more generalised superclasses.
9) What is meant by Polymorphism?
Polymorphism literally means taking
more than one form. Polymorphism is a characteristic of being able to
assign a different behavior or value in a subclass, to something that
was declared in a parent class.
10) What is an Abstract Class?
Abstract class is a class that has no
instances. An abstract class is written with the expectation that its
concrete subclasses will add to its structure and behaviour, typically
by implementing its abstract operations.
11) What is an Interface?
Interface is an outside view of a
class or object which emphaizes its abstraction while hiding its
structure and secrets of its behaviour.
12) What is a base class?
Base class is the most generalised
class in a class structure. Most applications have such root classes. In
Java, Object is the base class for all classes.
13) What is a subclass?
Subclass is a class that inherits from one or more classes
14) What is a superclass?
superclass is a class from which another class inherits.
superclass is a class from which another class inherits.
15) What is a constructor?
Constructor is an operation that creates an object and/or initialises its state.
16) What is a destructor?
Destructor is an operation that frees
the state of an object and/or destroys the object itself. In Java, there
is no concept of destructors. Its taken care by the JVM.
17) What is meant by Binding?
Binding denotes association of a name with a class.
18) What is meant by static binding?
Static binding is a binding in which
the class association is made during compile time. This is also called
as Early binding.
Static binding is a binding in which the class association is made during compile time. This is also called as Early binding.
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