Introduction to Object Oriented Concepts
In this section we will discuss objects classes their attributes operations and various features of objects oriented approach.
Classes and Objects
Objects and classes are the disuses building blocks of any OO based project. They are discussed below one by one with their representation formats.
Objects
Objects represent some entities access methods from its parent class and has attributes that distinguish them from other objects in the system. They can represent anything with which properties and behaviour can be associated, where properties describe the current state of the object and behaviour shows the way an object acts and reacts thereby changing its state.
Two operations on objects are very useful in the software engineering concepts:
Object oriented analysis which decides which objects will be important to the users:
Then it work on the structure relationships and behaviour of these objects.
Objects Oriented design considers the physical representation of objects, their storage issues etc.
Class
A class is the units of data abstraction in an object oriented program. It is like a template for any number of objects to be derived. It can be thought of as a data type and object is thought as a variable of that type. So all the objects with the same properties and behaviour are instances of one class.
A class contains all the code that relates to its objects. The code encapsulates:
An instance of the class is the result of the creation of a class whereas an instance variable can be defined as each class declares some variable corresponding to the data that will be present in each instance. Such variable are called instance variables. Next terms is the class variable a variable whose value is shared by all instances of a class such variable is a class variable. If one instance manipulates the value of a class variable then all the other instances see the same changed value.
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