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This is what I see in java, and it puzzles me.
Long.toHexString(0xFFFFFFFF) returns ffffffffffffffff
Similarly, 0xFFFFFFFF and Long.parseLong("FFFFFFFF", 16) are unequal.
As others have said,
0xFFFFFFFFevaluates to the int value-1, which is promoted to along.To get the result you were expecting, qualify the constant with the
Lsuffix to indicate it should be treated as along, i.e.Long.toHexString(0xFFFFFFFFL).