How do I clone a generic List in Java?

Question

I have an ArrayList that I\'d like to return a copy of. ArrayList has a clone method which has the following signature:

Answer 1

With Java 8 it can be cloned with a stream.

import static java.util.stream.Collectors.toList;

...

List<AnObject> clone = myList.stream().collect(toList());

Answer 2

ArrayList newArrayList = (ArrayList) oldArrayList.clone();

Answer 3

This is the code I use for that:

ArrayList copy = new ArrayList (original.size());
Collections.copy(copy, original);

Hope is usefull for you

Answer 4

Why would you want to clone? Creating a new list usually makes more sense.

List<String> strs;
...
List<String> newStrs = new ArrayList<>(strs);

Job done.

Answer 5

This should also work:

ArrayList<String> orig = new ArrayList<String>();
ArrayList<String> copy = (ArrayList<String>) orig.clone()

Answer 6

ArrayList first = new ArrayList ();
ArrayList copy = (ArrayList) first.clone ();