Java中的BigInteger类？

我不了解Java中的BigInteger类。你能帮助我吗，，， 公开的

公共BigInteger（整数位长度、整数确定性、随机rnd）

bitLength参数是他如何解释的

谢谢

这将创建指定长度的随机

biginger

bitLength - bitLength of the returned BigInteger.
certainty - a measure of the uncertainty that the caller is willing to tolerate.
            The probability that the new BigInteger represents a prime number will 
            exceed (1 - 1/2certainty). The execution time of this constructor is
            proportional to the value of this parameter.

rnd - source of random bits used to select candidates to be tested for primality.