How can I get a copy of a ArrayList() object instad of a refrence;

Question

if I ge

ArrayList<String> myList;
// add some stuff to myList
ArrayList<String> copyOf=myList;

copy will be a reference to myList, thus if I change copyOf, myList will change to. Hpw can I make coyyOf be a copy of myList, so if copyOf chnages, myList will not change.

@StaticBeagle not a dupe. That other one's about doing a deep copy. — Dawood ibn Kareem, Jun 07 '18 at 21:17
@DawoodibnKareem Some of the top answers is pratically as you answered. — NiVeR, Jun 07 '18 at 21:18
Then you should downvote them there. My answer would be incorrect as an answer to that other question. — Dawood ibn Kareem, Jun 07 '18 at 21:22
A more general comment: The problem you have is one of the things that drive people towards using immutable objects such as [ImmutableList](https://google.github.io/guava/releases/21.0/api/docs/com/google/common/collect/ImmutableList.html). — arnt, Jun 08 '18 at 06:49

score 1 · Accepted Answer · answered Jun 07 '18 at 21:16

Use the constructor of ArrayList that takes a collection as a parameter.

List<String> myCopy = new ArrayList<>(theArrayListToCopy);

According to the Javadoc, this "Constructs a list containing the elements of the specified collection, in the order they are returned by the collection's iterator."

How can I get a copy of a ArrayList() object instad of a refrence;

1 Answers1