high bits of long multiplication in Java?

Question

Is there any way to get the high half of the multiplication of two longs in Java? I.e. the part that vanishes due to overflow. (So the upper 64 bits of the 128-

Answer 1

Java 9 has Math.multiplyHigh, which according to the Javadocs "Returns as a long the most significant 64 bits of the 128-bit product of two 64-bit factors."