ABSTRACT CLASS
INTERFACE
Cannot be instantiated but it may provide
implementation of some of its methods. At least
implementation of one method is not specified.
This method has to be overridden.
Cannot provide any implementation. It just
provides the signature.
Only one class may inherit from only one class
Many interfaces may be implemented
Access modifiers may be specified in an abstract
class
All methods and properties are public. We cannot
specify the access modifiers by ourselves
If various implementations are of the same kind
and use common behavior then abstract class is
better to use.
If various implementations only share method
signatures then it is better to use interface
public interface IVehicle
{
void Start();
void Drive();
void Park();
void ChangeGear(int gear);
}
public class Vehicle : IVehicle
{
public void Start()
{
Console.WriteLine("The vehicle has been started");
}
public void Drive()
{
Console.WriteLine("The vehicle is being driven");
}
public void Park()
{
Console.WriteLine("The vehicle is being parked");
}
public void ChangeGear(int gear)
{
Console.WriteLine("Gear changed to " + gear.ToString());
}
}
public abstract class Vehicle
{
public void Start()
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