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Can someone explain this code?

 
Ranch Hand
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This is an inputfilter which allows 5 numbers before and after a dot.
I understand pretty much everything except for:
-where it says that there can only be 1 dot to be set.
- what source.toString() means in
 
Rancher
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what source.toString() means


That code calls the toString() method for the class that source is an instance of.  The API doc says it returns a String.
 
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