Code

import java.util.*;
public class HelloWorld{

    public static void main(String []args)
    {
        //Insantiating variables
        //Multipliedthing is the product of a given 17 integers
        int multipliedthing=0;
        //Finalthing is largest product of 17 integers found so far
        int finalthing=0;

        String numberString= "731671765313362491922511967442657474235534919493496983523127745632623957831816984818694788518438586156789112949495459517379583319528532885511125469874715852386357156932996329522744343557668966489544524452316173185643987111217223831136222989342338381353362766142828644448664523874933589729629491564477239713815158593796866717242712188399879798792274921916997288893776657273331533678812223542189751254545947522435258497711675561364839586446763244157221553975369781797784617464955149298625693219784686224828397224137565756574926147972968652414535147482166374844319989889524345658541227588666881164271714799244429282386346567481391912316282458617866458359124566529476545682848912883142676942242192267155626321111193754421756941658964871984385962455444362981239878799272442849918884581561669791913387549925246368991256717665886116467194577541225698315525593572972571636269561882674282524836823257534275296345";

        //Converting the numbers into an array of ints
        int[] numbers= new int[numberString.length()];
        for (int i=0; i<numberString.length(); i++)
        {
            numbers[i]=Character.getNumericValue(numberString.charAt(i));

        }

        //Finding the product of sets of numbers
        for (int i=0; i<numbers.length-17; i++)
        {
            multipliedthing=numbers[i];
            for (int j=1; j<17; j++)
            {
                multipliedthing*=numbers[i+j];
            }

            //Tests to see if that product is the largest one created
            if (multipliedthing>finalthing)
            {
                finalthing=multipliedthing;

            }
         }

        //Prints the largest thing found
        System.out.println(finalthing);
    }
}