Trying to add numbers from a file into an array then print the array in formatted columns in java

I am new to programming and I am having some trouble taking a file with a list of numbers and converting it to an array of integers that I can then print in formatted columns (5 rows and 10 columns). I think I did the import correct using an ArrayList but when I try to print the columns I run into issues. I think I need to use a for loop to get the columns to print but I'm not 100% sure. Any amount of help would be greatly appreciated! Here is my code:

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class Numbers {

    private List < Integer > data = new ArrayList < Integer > (); //Create ArrayList

    public static void main(String[] args) {
        String filename = "C/Users/s/Desktop/file4/Input.txt";

        Numbers rfe = new Numbers();
        rfe.readFile(filename);
    }



    private void readFile(String name) {
        String input;

        try (BufferedReader reader = new BufferedReader(new FileReader(name))) {

            while ((input = reader.readLine()) != null) {
                data.add(Integer.parseInt(input)); //Add each parsed number to the arraylist
                int[] i = input;

                for (i; i < null; i++) {
                    System.out.format("%20s, %10s", i);
                }

            }
        } catch (FileNotFoundException fnfe) {

        } catch (IOException ioe) {

        } catch (Exception ex) { // Not required, but a good practice
            ex.printStackTrace(); //Usually good for general handling
        }
    }
}

this is what the file contains (each number in a line):

32
73
63
47
72
34
26
84
27
75
95
10
48
88
28
65
71
40
14
11
67
76
77
80
12
15
30
74
13
41
21
22
57
17
99
92
52
38
18
46
62
64
39
16
43
29
79
49
19
60

You have two problems within your code. All of then at this portion:

while ((input = reader.readLine()) != null) {
    data.add(Integer.parseInt(input)); //Add each parsed number to the arraylist
    int[] i = input;

    for (i; i < null; i++) {
        System.out.format("%20s, %10s", i);
    }
}

First you did it right, you've added the readed number into your list: data.add(Integer.parseInt(input)); and this is all you need for this requirement add the number from the file to your list so you just need this for your while:

while ((input = reader.readLine()) != null) {
    data.add(Integer.parseInt(input)); //Add each parsed number to the arraylist
}

After that you want to print it, the error you are seeing is because you are making a wrong assignment int[] i = input; forget about this, you don't need it.

You need to loop through your list to print all the numbers

for (int i=0; i<data.size(); i++){
    System.out.format("%20s, %10s", i); //here is your another problem
}

You want to print on that line two parameters "%20s, %10s" but you only give one so either print only one or pass the i twice:

System.out.format("%20s, %10s", i, i); //twice

Or

System.out.format("%10s", i); //just once