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Prevent Derivation (Java and C# Cross Reference Guide)

By Mike Prestwood

Java versus C#: A side by side comparison between Java and C#.

OOP Details

More object oriented (OO) stuff.

Prevent Derivation

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Languages Focus

How do you prevent another class from inheriting and/or prevent a class from overriding a member.

Java:  "final class" Final

In Java, there is the concept of a final class.

More Info / Comment
C#:   sealed

With C#, use the sealed keyword to prevent a class from being inherited from and to prevent a method from being overridden.

A method marked sealed must override an ancestor method. If you mark a class sealed, all members are implicitly not overridable so the sealed keyword on members is not legal.

Syntax Example:
public class Machine : System.Object
public virtual void Speak(String pSentence)

public class Robot : Machine
public sealed override void Speak(String pSentence)
public sealed class Cyborg : Robot

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