Project Euler > Problem 16 > Power digit sum (Java Solution)

Problem:

2¹⁵ = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.

What is the sum of the digits of the number 2¹⁰⁰⁰?

Solution:

1366

Code:
The solution may include methods that will be found here: Library.java .

public interface EulerSolution{

public String run();

}

/* 
 * Solution to Project Euler problem 16
 * By Nayuki Minase
 * 
 * http://nayuki.eigenstate.org/page/project-euler-solutions
 * https://github.com/nayuki/Project-Euler-solutions
 */

import java.math.BigInteger;


public final class p016 implements EulerSolution {
 
 public static void main(String[] args) {
  System.out.println(new p016().run());
 }
 
 
 public String run() {
  String temp = BigInteger.ONE.shiftLeft(1000).toString();
  int sum = 0;
  for (int i = 0; i < temp.length(); i++)
   sum += temp.charAt(i) - '0';
  return Integer.toString(sum);
 }
 
}