code: @Override
      public void setSeed(long seed) {
          if (initialized) {
              throw new UnsupportedOperationException();
          }
          initialized = true;
          rnd = (seed ^ multiplier) & mask;
      }
docs: Throws {@code UnsupportedOperationException}.  Setting seeds in
  this generator is not supported.
  
  @throws UnsupportedOperationException always