Custom Compact Number Patterns With JDK 12 Compact Number Formatting

The post "Compact Number Formatting Comes to JDK 12" has been the subject of discussion on a Java subreddit thread. Concerns expressed in that thread related to a presentation of the compact number formatting deal with digits of precision displayed and the compact number patterns displayed. The digits of precision can be addressed via use of CompactNumberFormat.setMinimumFractionDigits(int), and this approach is discussed in more detail in the post "Using Minimum Fractional Digits with JDK 12 Compact Number Formatting." The second issue (dislike for the compact patterns used in the pre-built CompactNumberFormat instances for certain languages) is addressed in this post.

As far as I can determine (and I certainly could be missing something), there's no method on CompactNumberFormat that allows for the compact number patterns to be set on an existing instance of CompactNumberFormat. However, if the constructor for CompactNumberFormat is used to obtain an instance of this class (rather than using one of the overloaded static factory methods on NumberFormat), then the compact number patterns can be supplied via that constructor to the new instance of CompactNumberFormat. This is demonstrated in the following code listing.

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