There are 26 numbers in the numbers.txt file. Those 26 numbers are supposed to be read to arr but instead I get 26 zeroes in my array.
Scanner scanner = new Scanner(new File("numbers.txt"));
int n = 0;
int i = 0;
while (scanner.hasNextInt()) {
scanner.next();
n++;
} // n is now 26
int[] arr = new int[n];
while (scanner.hasNextInt()) {
for (i = 0; i < arr.length; i++) {
arr[i] = scanner.nextInt();
}
}
System.out.print(Arrays.toString(arr));
zeroes are default value for array. a scanner is "single-use", it's single-pass. you used it once, you have to create another (maybe by earlier having the File object in a variable and then using it to create both Scanners?) or somehow reverse its state. the second loop has zero iterations, it never hasNextInt anymore
Mika is right -- you need to repeat the scanner = new Scanner(...) after your // n is now 26 line.
Or, better, use an ArrayList<Integer>() rather than int[], then you only need a single pass:
public static void main(String[] args) throws Exception {
List<Integer> numbers = new ArrayList<>();
Scanner scanner = new Scanner(new File("numbers.txt"));
while (scanner.hasNextInt()) {
numbers.add(scanner.nextInt());
}
System.out.print(numbers);
}
