The arraylist class method returns the current arraylist size.
a.
length
b.
size
c.
rows
d.
capacity

b. size

Explanation:

We can use the size() method of java.util.ArrayList to determine the size of an  ArrayList in Java. The size() method of the ArrayList class returns an integer which is equal to the number of elements present in the ArrayList.

Below is an example code to illustrate the use of the size() method of the ArrayList:-

     ArrayList<Integer> aList = new ArrayList<Integer>(5);

      aList.add(25);

     aList.add(2);

     aList.add(5);

     aList.add(22);

     System.out.println("Size of the array list: " + aList.size());

This will print the size of the array list as 4 since we've added four numbers into the array list.

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