Why singleton classes cannot be sub-classed?

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I was going through the negative effects of singleton. Here is one of the point that I cannot understand at all. Here is the link and the point.

Negative sides of Singleton

The following points are used against the Singleton pattern:

    They deviate from the Single Responsibility Principle. A singleton class has the responsibility to create an instance of itself along with other business responsibilities. However, this issue can be solved by delegating the creation part to a factory object.
    Singleton classes cannot be sub classed. 

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asked 15 secs ago

SHREYAS JOSHI

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