I have wrong answer for project Euler#8

Question

I can't know why wrong this question. I search google although I can't understand. Thank you for helping :).The problem is=

The four adjacent digits in the 1000-digit number that have the greatest product are 9 × 9 × 8 × 9 = 5832.

73167176531330624919225119674426574742355349194934 96983520312774506326239578318016984801869478851843 85861560789112949495459501737958331952853208805511 12540698747158523863050715693290963295227443043557 66896648950445244523161731856403098711121722383113 62229893423380308135336276614282806444486645238749 30358907296290491560440772390713810515859307960866 70172427121883998797908792274921901699720888093776 65727333001053367881220235421809751254540594752243 52584907711670556013604839586446706324415722155397 53697817977846174064955149290862569321978468622482 83972241375657056057490261407972968652414535100474 82166370484403199890008895243450658541227588666881 16427171479924442928230863465674813919123162824586 17866458359124566529476545682848912883142607690042 24219022671055626321111109370544217506941658960408 07198403850962455444362981230987879927244284909188 84580156166097919133875499200524063689912560717606 05886116467109405077541002256983155200055935729725 71636269561882670428252483600823257530420752963450

Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?

public static void main(String[] args) 
{
    String str= "73167176531330624919225119674426574742355349194934"+
                "96983520312774506326239578318016984801869478851843"+
                "85861560789112949495459501737958331952853208805511"+
                "12540698747158523863050715693290963295227443043557"+
                "66896648950445244523161731856403098711121722383113"+
                "62229893423380308135336276614282806444486645238749"+
                "30358907296290491560440772390713810515859307960866"+
                "70172427121883998797908792274921901699720888093776"+
                "65727333001053367881220235421809751254540594752243"+
                "52584907711670556013604839586446706324415722155397"+
                "53697817977846174064955149290862569321978468622482"+
                "83972241375657056057490261407972968652414535100474"+
                "82166370484403199890008895243450658541227588666881"+
                "16427171479924442928230863465674813919123162824586"+
                "17866458359124566529476545682848912883142607690042"+
                "24219022671055626321111109370544217506941658960408"+
                "07198403850962455444362981230987879927244284909188"+
                "84580156166097919133875499200524063689912560717606"+
                "05886116467109405077541002256983155200055935729725"+
                "71636269561882670428252483600823257530420752963450";
    char chr[] = new char[str.length()];
    chr=str.toCharArray();
    long bignumber=0;
    for (int i = 0; i < chr.length; i++) 
    {
        if(i<=986)
        {
            if(chr[i+0]*chr[i+1]*chr[i+2]*chr[i+3]*chr[i+4]*chr[i+5]*chr[i+6]*chr[i+7]*chr[i+8]*chr[i+9]*chr[i+10]*chr[i+11]*chr[i+12]>bignumber)
            {
                bignumber=chr[i+0]*chr[i+1]*chr[i+2]*chr[i+3]*chr[i+4]*chr[i+5]*chr[i+6]*chr[i+7]*chr[i+8]*chr[i+9]*chr[i+10]*chr[i+11]*chr[i+12];
            }
        }
    }
    System.out.println(bignumber);
}

Answer 1

Product is 23514624000.
Sequence is 5576689664895.

code is -

public class Test{

     public static void main(String []args){
        String str= "73167176531330624919225119674426574742355349194934"+
                "96983520312774506326239578318016984801869478851843"+
                "85861560789112949495459501737958331952853208805511"+
                "12540698747158523863050715693290963295227443043557"+
                "66896648950445244523161731856403098711121722383113"+
                "62229893423380308135336276614282806444486645238749"+
                "30358907296290491560440772390713810515859307960866"+
                "70172427121883998797908792274921901699720888093776"+
                "65727333001053367881220235421809751254540594752243"+
                "52584907711670556013604839586446706324415722155397"+
                "53697817977846174064955149290862569321978468622482"+
                "83972241375657056057490261407972968652414535100474"+
                "82166370484403199890008895243450658541227588666881"+
                "16427171479924442928230863465674813919123162824586"+
                "17866458359124566529476545682848912883142607690042"+
                "24219022671055626321111109370544217506941658960408"+
                "07198403850962455444362981230987879927244284909188"+
                "84580156166097919133875499200524063689912560717606"+
                "05886116467109405077541002256983155200055935729725"+
                "71636269561882670428252483600823257530420752963450";
    char chr[] = new char[str.length()];
    chr=str.toCharArray();
    long product = 0;
    String digits = "";
    for (int i = 0; i < chr.length - 13; i++) 
    {   
        long product1 = (long)Character.getNumericValue(chr[i+0])*Character.getNumericValue(chr[i+1])*Character.getNumericValue(chr[i+2])*Character.getNumericValue(chr[i+3])*Character.getNumericValue(chr[i+4])*Character.getNumericValue(chr[i+5])*Character.getNumericValue(chr[i+6])*Character.getNumericValue(chr[i+7])*Character.getNumericValue(chr[i+8])*Character.getNumericValue(chr[i+9])*Character.getNumericValue(chr[i+10])*Character.getNumericValue(chr[i+11])*Character.getNumericValue(chr[i+12]);

        if(product < product1)
            {
                product = product1;
                digits = ""+chr[i+0]+chr[i+1]+chr[i+2]+chr[i+3]+chr[i+4]+chr[i+5]+chr[i+6]+chr[i+7]+chr[i+8]+chr[i+9]+chr[i+10]+chr[i+11]+chr[i+12];
            }
    }
    System.out.println(product);
    System.out.println(digits);

     }
}

Answer 2

You are multiplying the numeric values of the characters instead of multiplying the digits.

Replace chr[i+x] with Character.getNumericValue(chr[i+x]).

Beside that, performing the multiplication twice for each 13 digits is wasteful. Do the multiplication once and store the result in a variable, so that you can re-use it.

Better yet, in each iteration you can take the result of the previous iteration, divide by the first digit of the previous iteration and multiply by the last digit of the current iteration. This will save you many multiplications. EDIT : Actually this optimization can only work if there are no zeroes in the number, so you can forget about it.