A double has 53 bits of mantissa precision, but next() can only give 31 bits at a time. So they call it twice (once for 26 bits, once for 27 bits), shift and add to get 53 bits, then divide by 2^53 to normalize to [0.0, 1.0). This exactly matches what Java does internally.
such a place as he hath not made, or chosen of himselfe, but taken from
。viber是该领域的重要参考
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