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Thanks Snark1994 for your solution, it can work too.
But I still don't know why "Formatter.format" can't work in that way?
The short answer, as ntubski pointed out, is because "formatter" is a CLASS, not a "function".
It doesn't just "return a string" (although, superficially, it might look like it).
Rather, it ACTS ON a "string buffer". When you're done (possibly after multiple "format()" operations on your class object), then (and only then) you can call "toString()" on it and get your final, completely formatted string.