What types of implementations of list-type collections exist that ensure internal copying when traversing their elements?

In Java, there is a list-type collection that provides internal copying when iterating over elements — this is CopyOnWriteArrayList from the java.util.concurrent package.

Features of CopyOnWriteArrayList:

• Each modification operation (adding, removing) creates a new copy of the internal array.
• Iterators of this collection work on an immutable snapshot of the data, allowing safe traversal of elements without ConcurrentModificationException.
• Suitable for scenarios with frequent reads and infrequent modifications.

Example of usage:

import java.util.concurrent.CopyOnWriteArrayList;

CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("one");
list.add("two");

for (String item : list) {
    System.out.println(item);
    // It is safe to modify the list during iteration
    list.add("three");
}

Thus, CopyOnWriteArrayList is a primary example of a list with internal copying during element traversal.