Object Oriented Programming Concepts

Object Oriented Concepts :-

Abstraction :- It allows you to show only necessary properties. Example RGB

Encapsulation :- Hide the inner complexity of the objects. Example Add to database, everything should be hided inside.

Abstraction and Encapsulation both will complement each other.

Inheritance :-

Inheritance helps to establish the parent-child relationship between classes. By doing so the child class will have the qualities of its parent plus the new qualities of himself.

Polymorphism :-

Poly mean “Many”. Depending on the condition the objects behavior changes. There are two kinds of polymorphism.

Static Polymorphism

                Method Overloading

                Operator Overloading

    public class Complex

    {

        private int real;

        public int Real

        { get { return real; } }

        private int imaginary;

        public int Imaginary

        { get { return imaginary; } }

        public Complex(int real, int imaginary)

        {

            this.real = real;

            this.imaginary = imaginary;

        }

        public static Complex operator +(Complex c1, Complex c2)

        {

            return new Complex(c1.Real + c2.Real, c1.Imaginary +                    c2.Imaginary);

        }

    }

Dynamic Polymorphism

                Method overriding

    public class Product

    {

        public int GetPrice(int quantity, int price)

        {

            return (quantity * price);

        }

        //Method Overridding

        public virtual string GetProductName()

        {

            return "Compressor";

        }

    }

    public class CommercialProduct : Product

    {

        public int GetPrice(int quantity, int price,int totalDiscount)

        {

            return (GetPrice(quantity, price) - totalDiscount);

        }

        public override string GetProductName()

        {

            return "Refrigerator";

        }

    }

Association, Aggregation and Composition :-

Assoication is nothing but “IS” a relationship between classes. Inheritance are type of IS a relationship.

Aggregation and Composition are nothing but “HAS” a relationship between classes. The difference between Aggregation and Compostion is, the lifetime of the object composite relationship will be same whereas in Aggreation relationship it is not.

Raja has a heart is an example for composition because both cant exist independently.

Raja has a shirt is an example for Aggregation because both can exist independently.