Java Math BigInteger.modPow() 方法

package com.codingdict;



import java.math.*;



public class BigIntegerDemo {



   public static void main(String[] args) {



      // create 3 BigInteger objects

      BigInteger bi1, bi2, bi3;



      // create a BigInteger exponent

      BigInteger exponent = new BigInteger("2");



      bi1 = new BigInteger("7");

      bi2 = new BigInteger("20");



      // perform modPow operation on bi1 using bi2 and exp

      bi3 = bi1.modPow(exponent, bi2);



      String str = bi1 + "^" +exponent+ " mod " + bi2 + " is " +bi3;



      // print bi3 value

      System.out.println( str );

   }

}