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

In JAVA - use the final keyword:

public final class FDetails

In C# - the sealed keyword:

sealed class FDetails

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

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# use the sealed keyword:

public sealed class fdetails{

}

In VB.net use the NotInheritable keyword:

public notinheritable class fdetails

end class

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