‘size’ specifies number of elements in the list, whereas capacity specifies how many elements the list can accommodate more.
For example,
List<Integer> list = new ArrayList<> (10);
Above statement defines an ArrayList of capacity 10 and size 0.
Let’s add one element to ArrayList.
list.add(23);
When you add one element to the list, size becomes 1 and capacity becomes 10.
What if you are inserting more elements greater than list capacity?
A new Array with more capacity is created to allocate more elements. All the existing elements of list are copied to new array (List is backed by an array).
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