How do I join two lists in Java?

Question

Conditions: do not modifiy the original lists; JDK only, no external libraries. Bonus points for a one-liner or a JDK 1.3 version.

Is there a simpler way than:

Answer 1

public static  List merge(List... args) {
    final List result = new ArrayList<>();

    for (List list : args) {
        result.addAll(list);
    }

    return result;
}