How to copy java.util.list Collection

Question

I am implementing a Java class responsible for ordering java.util.List. The problem comes when I use this class. I\'m able to ordering the list but I want to copy the \"original

Answer 1

Use the ArrayList copy constructor, then sort that.

List oldList;
List newList = new ArrayList(oldList);
Collections.sort(newList);

After making the copy, any changes to newList do not affect oldList.

Note however that only the references are copied, so the two lists share the same objects, so changes made to elements of one list affect the elements of the other.