How can i read digits one by one?

Question

I try to read the numbers from the file with scanner. But I can't read one by one. How can i do that?

This is my txt

000000000000000000000000000000000000000

and this is my code

ArrayList<Integer>x = new ArrayList<>();

    Scanner scan;

    try {
        scan = new Scanner(new FileInputStream(new File("d:/deneme.txt")));
        while(scan.hasNext()){
            int y = scan.nextInt();
            System.out.println(y);
            x.add(y);               
        }
        scan.close();
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Adam Yost · Answer 1 · 2014-06-09T18:10:17.300

6

When you read in nextInt, it treats 000000000000000000000 as 0. If you use String y = scan.next(), then parse by checking y.charAt(i) in a for loop you will check the digit in each location of the number string.

That char must then be parsed id you want to store it as an int, so use

int x = Character.getNumericValue(y.charAt(i));

edited Jun 09 '14 at 18:10

answered Jun 09 '14 at 17:45

Adam Yost

3,616
23
36

How can i find y's size? – user3717742 Jun 09 '14 at 17:49
I remembered now. My mistake. Sorry. Thank you for your help. – user3717742 Jun 09 '14 at 17:52
I see 39 piece of my txt. – user3717742 Jun 09 '14 at 17:54
When i try the add "0" my arraylist, it see "48". I didn't get it. – user3717742 Jun 09 '14 at 18:05
I should have been more clear, `String y = scan.next()` then get the digit by using `char x = y.charAt()` By casting to an int you are getting the ASCII value. Letm e fix my answer to help. – Adam Yost Jun 09 '14 at 18:08

How can i read digits one by one?

1 Answers1