Convert long to two int and vice versa

Question

How can I convert two 32 bit integers (int) to one 64 bit long and vice versa?

Answer 1

long c = (long)a << 32 | b & 0xFFFFFFFFL; int aBack = (int)(c >> 32); int bBack = (int)c; 

In Java, you don't need quite so many parentheses, or any masking on the reverse calculation.