Regarding already defined slots in arraylists

Question

I'm wondering if it's possible to prefill the slots for an arraylist? For example, it is possible to fill out the st array by the assignment operation like this:

    student [] st = new student[3];
    st[0] = new student("214365879","eric banner", 67);
st[1] = new student("988634321","tony park",45);
st[2] = new student("009451223","paul summers",59);

But how is it possible by using arraylist instead?

Answer 1

It is possible to do by using add method from ArrayList

Person p1 = new Person("Izak","1234",33);
Person p2 = new Person("Igal","5668", 25);

List<Person> pList = new ArrayList<>();
pList.add(p1);
pList.add(p2);

Answer 2

These are about as close as I can think to that sort of syntax.

List items = new ArrayList() {{
  add("A");
  add("B");
}};

Or

List items = Arrays.asList(new String[] { "A", "B" });

Answer 3

There's a constructor on ArrayList that takes an integer that tells the ArrayList the initial capacity.