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

I'm not claiming that it's simple, but you mentioned bonus for one-liners ;-)

Collection mergedList = Collections.list(new sun.misc.CompoundEnumeration(new Enumeration[] {
    new Vector(list1).elements(),
    new Vector(list2).elements(),
    ...
}))