title: Java: Implementing a Unsigned 128bit Integer
body: <p><strong>first off I should ask:</strong><br>
  <strong>Does anyone knows of a current implementation 128b UINT for Java?</strong></p>
  
  <p>I need something to hold natural cardinal values.  ie: A huge counter.<br>
  I know of BigIntegers, which are slow and immutable.  A 128b UINT makes sense ...</p>
  
  <p>I was thinking about implementing an OWORD, using a pair of primitive longs.</p>
  
  <p>Overflows would throw an Exception and not Wraparound.</p>
  
  <p><strong>What example sourcecode/blogs should I look to for implementing the workings of this class?</strong></p>