Line 10: The add method checks and increases the storage for the ArrayList if necessary.

The new value is added to the end of the ArrayList.

    1     public static void init(ArrayList<Integer> a)
    2     {
    3       Random r = new Random();
    4       Scanner in = new Scanner(System.in);
    5   
    6       System.out.print("How many random integers: ");
    7       int n = in.nextInt();
    8   
    9       for(int i = 0; i < n; i++) {
   10         a.add(r.nextInt(101));
   11       }
   12     }