respondsTo and constructors

[Schalk Cronjé]

I cannot figure out how to check for a constructor using respondsTo. If 
I had the following

   class ABC {
      ABC(String s, File f) {}
   }
How can I use respondsTo to see if the constructor exists?

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Schalk W. Cronjé
Twitter / Ello / Toeter : @ysb33r