What do you intend doing with element arrayname[0]?

Yes.

Feel free to drop by once you formulate a specific question.
But please review your course notes, hack out some code[1],
and read the PhySci FAQ[2] carefully before replying.

[1] Have you done the HelloWorld program?
[2] <http://www.physci.org/codes/javafaq.jsp>

You're very much welcome.

Here is a quick hack. The lines are read into an arraylist which is
then copied to an array. The first integer is stored in arr[0] i.e.
integer k is stored in arr[k-1]. If thats not what you want, you can
fix it easily.

       BufferedReader in = new BufferedReader(new
FileReader("data.txt")) ;
       String line = "" ;
       ArrayList nums = new ArrayList() ;
       while((line = in.readLine())!=null){
           int num ;
           try{
               num = Integer.parseInt(line) ;
               nums.add(new Integer(num));
           }catch(NumberFormatException e){}
       }
       int[] arr = new int[nums.size()] ;
       for(int i = nums.size() ; --i>=0 ;){
           arr[i] = ((Integer)nums.get(i)).intValue() ;
       }