code: public void setBytes(byte[] data, int size) {
          System.arraycopy(data, 0, this.data, 0, data.length);
          this.size = size;
      }
docs: Sets the <tt>byte[]</tt> which stores
  the bits of this <tt>BitVector</tt>.
  <p>
  
  @param data a <tt>byte[]</tt>.
  @param size Size to set the bit vector to