ArrayList: how does the size increase?

Question

I have a basic question on Java ArrayList.

When ArrayList is declared and initialized using the default constructor, memory space for 10 el

Answer 1

(oldSize * 3)/2 + 1

If you are using default constructor then initial size of ArrayList will be 10 else you can pass the initial size of array while creating the object of ArrayList.

Example: In case default constructor

List list = new ArrayList<>();
list.size()

Example: In case parameterized constructor

List list = new ArrayList<>(5);
list.size()