jessu coughed up:

YES.  In fact, you should almost *always* use NumberFormat for both writing
and reading in numbers.

NumberFormat is locale sensitive.  If your program is run by some person in
the UK, it'll know to swap the "." and ",".  If in some of the weirder
countries, it knows to group some of the digits by four.

Try to use it's parse() as well!!!!  Many times you'll get a user enterring
in (say)

   12,440.00

For input.  You want this to work seamlessly!  Far more likely, in the UK
you might get:

   124400,00

You just don't want your program to gack on this.

Roedy Green coughed up:

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