Passing a Map object into a constructor with optional parameters?

I have a Map with a 1:1 ratio on the optional constructor parameters for my class. The issue is that I can't do: test = new Foo(myMap);.

Is there a way to explode it out, or should I change it around such that it accepts a Map and then loop over the Map?

I was hoping I could do it by exploding the Map's key-value pairs but I don't think that is likely.

I remember a previous post discussing just accepting the Map and then parsing it inside the constructor.