When you call the clone() method of an ArrayList, a shallow copy of the list is created.
The new list refers to the same set of elements as the original.
It does not duplicate those elements.
Since clone() is a method of the ArrayList class and not the List (or Collection) interface,
you must call clone() on a reference to the class, not the interface.
import java.util.ArrayList;
import java.util.List;
public class MainClass {
public static void main(String[] a) {
List list = new ArrayList();
list.add("A");
List list2 = ((List) ((ArrayList) list).clone());
System.out.println(list);
System.out.println(list2);
list.clear();
System.out.println(list);
System.out.println(list2);
}
}
[A]
[A]
[]
[A]