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

Use a Helper class.

I suggest:

public static  Collection addAll(Collection dest, Collection... src) {
    for(Collection c : src) {
        dest.addAll(c);
    }

    return dest;
}

public static void main(String[] args) {
    System.out.println(addAll(new ArrayList