Reading array from txt file?

Question

This file reads from a text file that has only one line:

  7319812227725338960527291316

and the output is:

Reading input values from text.txt
731
981
222
772
533
89
60
527
291
316

Question is How does the program give this output? I don't know how it stores 3 digits in each array cell?

I also noticed that when I copy content of the txt file to Word, it pastes this

   7319812227725338960527291316

into a column:

The text file is from my teacher. But when I create my own text file and place a number like 123 456 789 the output makes sense since numbers in txt file are separated by space and hence each number will be assigned to an array cell.

 import java.util.Scanner;
 import java.util.Vector;
 import java.util.Arrays;
 import java.io.File;

 public class test{

 public static void main(String[] args){
    Scanner s;
    if (args.length > 0){
        try{
            s = new Scanner(new File(args[0]));
        } catch(java.io.FileNotFoundException e){
            System.out.printf("Unable to open %s\n",args[0]);
            return;
        }
        System.out.printf("Reading input values from %s.\n",args[0]);
    }else{
        s = new Scanner(System.in);
        System.out.printf("Enter a list of non-negative integers. Enter a      negative value to end the list.\n");
    }
    Vector<Integer> inputVector = new Vector<Integer>();

    int v;
    while(s.hasNextInt() && (v = s.nextInt()) >= 0)
        inputVector.add(v);

    int[] array = new int[inputVector.size()];

    for (int i = 0; i < array.length; i++){
        array[i] = inputVector.get(i);
                    System.out.println(array[i]);
            }

}

}

That's likely is that you are opening the test file in Windows Notepad which doesn't properly handle newline (\n) characters. — user2209008
– user2209008, Commented Jan 27, 2016 at 1:25

Ulises · Accepted Answer · 2016-01-27 00:53:09Z

3

The problem is the line ending character. Your machine's text editor doesn't understand the line breaks inserted by your professors program. But your java program does check for other OS's line endings. That's why your Java program can actually pick up the right numbers. I'm sure you can open the text file from your teacher with a different text editor (like Sublime) that will allow you see and convert file with different line ending characters

answered Jan 27, 2016 at 0:53

Ulises

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2 Comments

33ted Over a year ago

Thanks a ton. someone else helped: You haven't said where you get your text from. If it came from a web-site there could be formatting within the text on the page. Does it paste OK into notepad? If so, copy from there. This will eliminate any unprintables from the text. – AFH

Ulises Over a year ago

It will depend on the program where you paste the text. Some programs will convert/alert you about some non-printable characters

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