Scanner input into array

[wizar]

I have inputs such as "1 2 3" being inputted into my program.
I am using Scanner to look for the numbers. I would like to put these numbers into an array, but how would I initialize the array size if the inputs vary in size? For example, what if the input has more than 3 numbers?

Here is the code I am working with:

Scanner scan = new Scanner(System.in);
    int [] array = new int [3];
    
    for (int i = 0; i < array.length; i++)
    {
      array[i] = scan.nextInt();
    }
    for (int z = 0; z< array.length; z++)
    {
      System.out.print(array[z] + " ");
    }

[Junky]

3 options:

1 - ask user how many numbers they are entering and then create an array with that size.

2 - create an array of some length. Keep track of how many numbers have been entered. When the array is full create a new bigger array. Copy values from old array to new array. Insert new value.

3 - use a List.