A DESCRIPTION OF THE PROBLEM :
Recently, I discovered Long.parseUnsignedLong() and Long.toUnsignedString(). (There are similar static methods for other integral types.) However, java.util.Formatter.format() does not support 'u' for unsigned integral conversion. For example, "%lu" could call Long.toUnsignedString(). If this idea was already considered but rejected, please kindly share the reason. I did a lot of searching before raising this RfE, but I cannot find any existing reports, nor discussions of this feature.