How to clone ArrayList and also clone its contents?

Question

How can I clone an ArrayList and also clone its items in Java?

For example I have:

ArrayList dogs = getDogs();
ArrayList

        

Answer 1

Basically there are three ways without iterating manually,

1 Using constructor

ArrayList dogs = getDogs();
ArrayList clonedList = new ArrayList(dogs);

2 Using addAll(Collection c)

ArrayList dogs = getDogs();
ArrayList clonedList = new ArrayList();
clonedList.addAll(dogs);

3 Using addAll(int index, Collection c) method with int parameter

ArrayList dogs = getDogs();
ArrayList clonedList = new ArrayList();
clonedList.addAll(0, dogs);

NB : The behavior of these operations will be undefined if the specified collection is modified while the operation is in progress.