Retrieve array[] of values from ArrayList of objects

Question

Let's say I have an ArrayList of objects. For example: ArrayList<Person> personList, where each Person has 2 class variables String name and int age. These variables each have their own getter methods getName() and getAge().

What is the simplest way to retrieve an array (or ArrayList) of int ages[]?

Note this question is similar to the verbosely titled "Retrieve an array of values assigned to a particular class member from an array of objects in java", though without the arbitrary restriction on for-loops, and using an ArrayList instead of an Array.

Answer 1

Create a target array of the same size as the list then iterate through the list and add each element's age to the target array.