Provides a combiner used to construct a collection.
The call to the apply method can create a new combiner each time.
The call to the apply method can create a new combiner each time.
If it does, this method returns false.
The same combiner factory may be used each time (typically, this is
the case for concurrent collections, which are thread safe).
If so, the method returns true.
Returns string formatted according to given format string.
Returns string formatted according to given format string.
Format strings are as for String.format
(@see java.lang.String.format).