how to prevent class 'a' from being inherited by another class?

I have a class named开发者_JAVA技巧 fdetails and I do not want any other class to inherit from this class.

Can I set it to not being inherited by another class. I would like to get this done in the following 3 languages:

• Java
• VB.NET 3.5
• C# 3.5

java: final  
vb: NotInheritable (NonOverrideable for properties)
c#: sealed

In Java use the final keyword:

public final class fdetails{

}

In C# use the sealed keyword:

public sealed class fdetails{

}

In VB.net use the NotInheritable keyword:

public notinheritable class fdetails

end class

In C# you use the sealed keyword in order to prevent a class from being inherited.

In VB.NET you use the NotInheritable keyword.

In Java you use the keyword final.

In JAVA - use the final keyword:

public final class FDetails

In C# - the sealed keyword:

sealed class FDetails

In order to prevent a class in C# from being inherited, the keyword sealed is used. Thus a sealed class may not serve as a base class of any other class. It is also obvious that a sealed class cannot be an abstract class. Code below...

//C# Example
sealed class ClassA
{
    public int x;
    public int y;
}

No class can inherit from ClassA defined above. Instances of ClassA may be created and its members may then be accessed, but nothing like the code below is possible...

class DerivedClass : ClassA { } // Error

Same in Java and VB.net:

java: final  
vb: NotInheritable (NonOverrideable for properties)

Alternatively to https://stackoverflow.com/a/4096427/5292885 answer, one can create the base class with private constructor to avoid inheritance (in C#, you get error like the class is inaccessible due to its protection level in case if you refer the base class)

For C#, it's the "sealed" keyword.

For Java, it's the "final" keyword.