int []num=new int[1001];

   FileReader fr = new FileReader("1.txt");

   BufferedReader br = new BufferedReader(fr);

 String str;

   StringBuilder sb = new StringBuilder();

   while((str=br.readLine())!=null)

   {

    sb.append(str);

   }

   String st=sb.toString();

    int sum=0,mynum;

    for(int i=0;i<st.length();i++)

    {

     num[i]=Integer.parseInt(st.substring(i,i+1));

    }