Object Oriented Programming

Basically, OOP has 4 principles to follow:

1. Encapsulation
2. Inheritance
3. Polymorphism
4. Abstraction

How if we want to use the existing class in another project without creating from scratch? We can utilize inheritance principle in OOP. Create a new class that has our new functionality, but also reuse the Point class (example).

In this game, we need MapLocation class that being subclass from Point class. Create a new MapLocation class.

class MapLocation : Point
{
    public MapLocation(int x, int y) : base(x,y)
    {

    }
}

So, our MapLocation class will have an attribute like Point class. We use base here because Point class is MapLocation's base class.