如何在 Java 中生成一个随机 BigInteger 值?
要生成 Java 中的随机 BigInteger,我们首先设置一个最小值和一个最大值 −
BigInteger maxLimit = new BigInteger("5000000000000"); BigInteger minLimit = new BigInteger("25000000000");
现在,减去最小值和最大值 −
BigInteger bigInteger = maxLimit.subtract(minLimit); Declare a Random object and find the length of the maxLimit: Random randNum = new Random(); int len = maxLimit.bitLength();
现在,使用长度和上面创建的随机对象设置一个新的 B 整数。
示例
import java.math.BigInteger; import java.util.Random; public class Demo { public static void main(String[] args) { BigInteger maxLimit = new BigInteger("5000000000000"); BigInteger minLimit = new BigInteger("25000000000"); BigInteger bigInteger = maxLimit.subtract(minLimit); Random randNum = new Random(); int len = maxLimit.bitLength(); BigInteger res = new BigInteger(len, randNum); if (res.compareTo(minLimit) < 0) res = res.add(minLimit); if (res.compareTo(bigInteger) >= 0) res = res.mod(bigInteger).add(minLimit); System.out.println("The random BigInteger = "+res); } }
输出
The random BigInteger = 3874699348568
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