There are two options to copy a Source List to another list.

Option 1: Use ArrayList constructor

ArrayList newList = new ArrayList(sourceList);

Option 2: Use Collection.copy()

To use Collections.copy() destination list should be of same or

larger size than source list.

ArrayList newList = new ArrayList

(sourceList.size());

Collections.copy(newList, sourceList);

Collections.copy() does not reallocate the capacity of destination

List if it does not have enough space to contain all elements of

source List. It throws IndexOutOfBoundsException.

The benefit of Collection.copy() is that it guarantees that the copy

will happen in linear time. It is also good for the scenario when we

want to reuse an array instead of allocating more memory in the

constructor of ArrayList.

One limitation of Collections.copy() is that it can accept only List

as source and destination parameters.

https://www.tutorialspoint.com/how-to-copy-a-list-to-another-list-in-java