how to read in from a file using scanner and display in a different order

Question

I have a file that contains numbers separated by a space, i can read in the file using scanner, and it displays just as the file shows it. How can i print the numbers vertically one by one?

try(Scanner reader = new Scanner(file)){
            while(reader.hasNextLine()){
                String line = reader.nextLine();
                System.out.println(line);
            }

Answer 1

You can use the operation split() on strings:
How to split a string in Java

String s = 1 2 3 4;
String[] result = s.split(" "); // this will split on space

Afterwards you can simply go through the array with a for-loop and print each value:

for(String str : result) {
    System.out.println(str);
}

Tipp: You can even limit the size of your array: string.split(" ", maxArraySize); will give you a String[] of length maxArraySize or shorter.

Answer 2

You need to split the resulting string from reader.nextLine() into an array.

try(Scanner reader = new Scanner(file)){
        while(reader.hasNextLine()){
            String line = reader.nextLine();
            //split line into an array, delimited by spaces
            String[] lines = line.split(" ");
            //loop through the resulting array
            for (int i = 0 ; i < lines.length; i++){
                //print each number on a single line
                System.out.println(lines[i]);
            }
        }

Answer 3

Split the line into a String[] by spaces and then iterate over the array printing each item on a new line.

String[] lines = line.split(" ");
for (String item : lines) {
    System.out.println(item);
}

Answer 4

you'll need to split the String by the delimiter " " then simply iterate over those elements.

String line = reader.nextLine();
Arrays.stream(line.split(" ")).forEach(System.out::println);