Java String Task 1

package task_1;

import java.io.*;

public class Strings_inerview
{
    public static void main(String[] args) throws IOException
    {
        int n=2;
        char in = 'x';
        String longestPol=" ";
        File file = new File("/Users/kolinsol/Documents/dev/example_text.txt");
        FileInputStream reader = new FileInputStream(file);
        byte MyString[] = new byte[(int)file.length()];
        reader.read(MyString);
        String OutString = new String(MyString);
        String[] OutStringArray = OutString.split(" ");
        for (int i=0; i<OutStringArray.length; i++)
        {
            System.out.println(OutStringArray[i].length());
            if(OutStringArray[i].length()>n)
            {
                StringBuilder tempString = new StringBuilder(OutStringArray[i]);
                tempString.setCharAt(n, in);
                System.out.println(tempString.toString());
            }
            else
                System.out.println(OutStringArray[i]);
        }
        System.out.println(longestPol);
    }
}