ReadFile

All you need to do is loop over every line in the file and store the values as integers.

Easiest way to populate an array of integers from a file:

<!-- language: lang-java -->

    import java.io.*;
    import java.util.*;

    public class ReadFile {
        public static void main(String[] args){
            BufferedReader br = null;
            Integer[] array = null;
            String filename = "input.txt";

            try {
                List<Integer> list = new ArrayList();
                String line = "";
                br = new BufferedReader(new FileReader(filename));

                while ((line = br.readLine()) != null)
                    list.add(Integer.parseInt(line));

                array = list.toArray(new Integer[list.size()]);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    if (br != null)
                        br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (array != null) {
                for (Integer i : array)
                    System.out.printf("%d", i);
            }
        }
    }