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Manish Kungwani

Object Oriented Principles

An introduction to the methods and principles …

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The task of a good software …

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Procedural approach (Algorithmic decomposition)

Object-oriented approach (Object-oriented decomposition)

Programming Methodologies

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Algorithmic Decomposition

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Object-oriented Decomposition

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Object – Any tangible/intangible entity that has state, behavior, and identity.

The structure and behavior of similar objects are defined in their common class.

The terms instance and object are interchangeable.

Object Oriented Programming

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Object

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AbstractionEncapsulationInheritancePolymorphism

Principles of Object Oriented Programming

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Abstraction

An abstraction denotes the essential characteristics of an object that distinguish it from all other kinds of objects and thus provide crisply defined conceptual boundaries, relative to the perspective of the viewer.

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Encapsulation

Encapsulation is the process of compartmentalizing the elements of an abstraction that constitute its structure and behavior; encapsulation serves to separate the contractual interface of an abstraction and its implementation.

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Inheritance

Inheritance is a relationship among classes wherein one class shares the structure and/or behavior defined in one (single inheritance) or more (multiple inheritance) other classes.

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Student -> {Name, Rollno, Date of birth}

Mechanical Engg. Student -> {Name, Rollno, Date of birth, Subject}

Mechanical Engg. Student IS A Student

Inheritance – An example

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Polymorphism is a concept in type theory wherein a name may denote instances of many different classes as long as they are related by some common superclass. Any object denoted by this name is thus able to respond to some common set of operations in different ways.

Polymorphism

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Strong TypingConcurrencyPersistence

Minor principles

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Strong Typing

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Concurrency

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Persistence

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Object-oriented programming is a method of implementation in which programs are organized as cooperative collections of objects, each of which represents an instance of some class, and whose classes are all members of a hierarchy of classes united via inheritance relationships.

Object Oriented Programming

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