Possible Duplicate:
Purpose of final and sealed
Hi all,
When should we opt for designing a sealed class?
When should we opt for designing a singleton class?
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These are two unrelated uses of a class.
A singleton should be used when you know that you will have exactly one instance of the class during its execution.
A sealed class simply means that it cannot be subclassed (or inherited). I don't know when it is good situation to mark a class as sealed, so I never do.