Java计算大整数

import java.util.*;
import java.math.*;                                                  //BigInteger类型在这个包里

public class Gcc_test {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        BigInteger a = new BigInteger("1111111111111111111111");     //也可手动输入
        BigInteger b = new BigInteger("3222222222222222222229");
        System.out.println(a.multiply(b));                           //高精度计算大数据
    }

}