What is the difference between abstract class vs interface? Can give me the real

What is the difference between abstract class vs interface? Can give me the real time examples?

Question Posted / tanya gautam

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What is the difference between abstract class vs interface? Can give me the real time examples?..

Answer / Sachin Bajpai

Abstract classes and interfaces are both used to achieve polymorphism in object-oriented programming, but they have some differences:

1. Method Implementation: Abstract classes can have concrete methods with implementation, whereas interfaces only define method signatures without implementation.
2. Inheritance: A class inherits from one abstract class, but can implement multiple interfaces.
3. Real-time example: Let's consider an example of a shape hierarchy where we have a Shape abstract class and two interfaces IPrintable and IResizable. The Shape abstract class could contain properties like Color and Name, while the IPrintable interface would define a Print() method and IResizable would define Resize() methods.
4. An example implementation might look something like this:

```csharp
public abstract class Shape
{
public string Color { get; set; }
public string Name { get; set; }
}

public interface IPrintable
{
void Print();
}

public interface IResizable
{
void Resize(int newSize);
}

public class Circle : Shape, IPrintable, IResizable
{
public double Radius { get; set; }

public void Print()
{
// Implementation of the print method for the circle shape
}

public void Resize(int newSize)
{
// Implementation of the resize method for the circle shape
}
}
```