first off I should ask:
Does anyone knows of a current implementation 128b UINT for Java?

I need something to hold natural cardinal values. ie: A huge counter.
I know of BigIntegers, which are slow and immutable. A 128b UINT makes sense ...

I was thinking about implementing an OWORD, using a pair of primitive longs.

Overflows would throw an Exception and not Wraparound.

What example sourcecode/blogs should I look to for implementing the workings of this class?

java integer implementation
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