1. In Polymorphism poly means “multiple” and morph means “forms” that means many forms.
2. In polymorphism we will declare methods with same
name and different parameters in same class.
3. or methods with same name and same parameters in
different classes.
In Polymorphism we have 2 different types those are
- Compile
Time Polymorphism (Called as Early Binding or Overloading
or static binding)
- Run
Time Polymorphism (Called as Late Binding or Overriding or
dynamic binding)
Compile Time Polymorphism or
Early Binding
Compile time polymorphism means we will declare
methods with same name but different signatures because of this we will perform
different tasks with same method name. This compile time polymorphism also
called as early binding or method overloading.
Method Overloading or compile time polymorphism
means same method names with different signatures (different parameters)
Example
public class Class1
{
public void
NumbersAdd(int a, int
b)
{
Console.WriteLine(a + b);
}
public void
NumbersAdd(int a, int
b, int c)
{
Console.WriteLine(a + b + c);
}
}
|
In above class we have two methods
with same name but having different input parameters this is called method
overloading or compile time polymorphism or early binding.
Run Time Polymorphism or Late
Binding
Run time polymorphism also called as late binding
or method overriding or dynamic polymorphism.
Run time polymorphism or method overriding means
same method names with same signatures.
In this run time polymorphism or method overriding
we can override a method in base class by creating similar function in derived
class this can be achieved by using inheritance principle and using “virtual
& override” keywords.
Example
|
public class clsShape
{
public int _radius =
5;
public virtual double getArea()
{
return 0;
}
}
public class clsCircle : clsShape
{
public override double getArea()
{
return 3.14 * _radius * _radius;
}
}
public class clsSphere : clsShape
{
public override double getArea()
{
return 4 * 3.14 * _radius * _radius;
}
}
|
||
As you can see from above code that
we have one base class "clsShape" with a "virtual"
method "getArea()" and two derived classes "clsCircle"
and "clsShape" each having an "override" method
"getArea()" with different implementations.
