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What is sealed class in C#? Can anyone give the example?

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What is sealed class in C#? Can anyone give the example?
posted Mar 7, 2016 by Naveen Kumar

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1 Answer

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Sealed Class

Sealed class is used to define the inheritance level of a class.

The sealed modifier is used to prevent derivation from a class. An error occurs if a sealed class is specified as the base class of another class.

Some points to remember:

  1. A class, which restricts inheritance for security reason is declared, sealed class.
  2. Sealed class is the last class in the hierarchy.
  3. Sealed class can be a derived class but can't be a base class.
  4. A sealed class cannot also be an abstract class. Because abstract class has to provide functionality and here we are
    restricting it to inherit.

Practical demonstration of sealed class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace sealed_class
{
class Program
{
public sealed class BaseClass
{
public void Display()
{
Console.WriteLine("This is a sealed class which can;t be further inherited");
}
}

    public class Derived : BaseClass
    {
        // this Derived class can;t inherit BaseClass because it is sealed
    }

    static void Main(string[] args)
    {
        BaseClass obj = new BaseClass();

        obj.Display();

        Console.ReadLine();
    }
}

}

answer Mar 8, 2016 by Vishi Gulati
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