The arraylist class method returns the current arraylist size.

ArrayList is a resizable-array implementation of the List interface in the JAVA programming language. In this array an item can be added at any point. The array size expands automatically to accommodate the new item.
The ArrayList class SIZE method returns the current ArrayList size.
Other methods are remove, add, get..

They were fooled by a lot of people

The five major components is processor main memory second memory and input devices and output devices