View source for Sealed Modifier

[[Category:OOP]]
[[Category:CSharp]]
[[Category:Extreme Programming]]

Prevents derivation of classes or overriding of methods. 
<pre class="brush:csharp;">
public sealed class Circle : Shape
</pre>
you cannot derive a class from Circle

<pre class="brush:csharp;">
public class Circle : Shape
{
  public sealed override void Draw()
  {
  .....
  }
}
</pre>
seal can be applied to only overriden methods. 
=== Why ? ===
Sealed classes are slightly faster because of some run time optimizations. 

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Related Subjects : [[interface]],  [[Polymorphism]], [[Abstract]]