我有两个简单的Java代码。第一个将恒定功率定义为power = a.pow（b）;

import java.math.BigInteger;    
public class FermatOne    
{    
    public static void main(String[] args)    
    {    
         BigInteger a = new BigInteger ("2");    
         BigInteger k = new BigInteger ("15");    
         BigInteger c = new BigInteger ("1");    
         int b = 332192810;    
         BigInteger n = new BigInteger ("2");    
         BigInteger power;    
         power = a.pow(b);    
         BigInteger exponent;    
         exponent = k.multiply(power);    
         BigInteger mod;    
         mod = exponent.add(c);    
         BigInteger result = n.modPow(exponent,mod);    
         System.out.println("Result is  ==> " + result);    
     }    
}

第二个将恒定功率定义为power = BigInteger.ONE.shiftLeft（b）

import java.math.BigInteger;    
public class FermatOne    
{    
    public static void main(String[] args)    
    {

         BigInteger k = new BigInteger ("15");    
         BigInteger c = new BigInteger ("1");    
         int b = 332192810;    
         BigInteger n = new BigInteger ("2");    
         BigInteger power;    
         power = BigInteger.ONE.shiftLeft(b);    
         BigInteger exponent;    
         exponent = k.multiply(power);    
         BigInteger mod;    
         mod = exponent.add(c);    
         BigInteger result = n.modPow(exponent,mod);    
         System.out.println("Result is  ==> " + result);    
     }    
}

在命令行中设置内存标志-
Xmx1024m，第一个代码可以正常工作，但是第二个代码却出现错误：java.lang.OutOfMemoryError：Java堆空间

我的问题：我应该在第二个代码中更改什么以避免java.lang.OutOfMemoryError？