<i18n dev> java.util.Fomatter precision and surrogate pairs

Jason Mehrens jason_mehrens at hotmail.com
Sun Feb 14 00:09:26 UTC 2021

Hi Naoto,

Sorry for the off thread reply.  I didn't have the mail replies setup on the list and I seem to be unable to add a in-reply-to header via web email.

> Although the error message may be confusing, 'c' conversion cannot be 
> used for a String argument (like in your example). It simply converts 
> numeric value into a single character, thus no need for output 
> "precision." I am not the designer of the class, so might be wrong.

Yes I totally missed that.  I dug up the relevant source:


So this code doesn't deal with CharSequence and therefore the precision is implicitly one.  With the exception if null getting converted to 4 chars.

Is it worth me filing an RFE to allow 'c' to accept a CharSequence and allow precision to be set?



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