code: public double getFast(int i0, int i1, int i2) {
          int c = offset;
          c += strides[0] * i0;
          c += strides[1] * i1;
          c += strides[2] * i2;
          return values.get(c);
      }
docs: Gets the value of the entry corresponding to the given indices.
  @param indices The indices of the multi-dimensional array.
  @return The current value.