Getting object from an ArrayList<T> of a specific type in java

Question

I've an ArrayList, for example b, and i want to get an ArrayList of Worker (Worker extend Person) from that ArrayList. b also contains other object that extends from Person.

How can i achive that? Thanks.

Answer 1

If you use Guava, it is as easy as:

ArrayList<Person> b;
ArrayList<Worker> a = Lists.newArrayList(Iterables.filter(b, Worker.class));