With the addition of library support for hexadecimal floating-point strings (bug 4826774) it would be convenient if those strings could also be used as floating-point literals in the Java source language, as is possible in C99.

A Java-style EBNF grammar for hexadecimal strings is available as part of the 4826774 work.

Having hexadecimal floating-point literal support would allow a precise way to specify floating-point constants that could then be propagated as constants by the compiler.