How do I join two lists in Java?

In Java 8:

List<String> newList = Stream.concat(listOne.stream(), listTwo.stream())                             .collect(Collectors.toList());

java list jdk1.5

Off the top of my head, I can shorten it by one line:

List<String> newList = new ArrayList<String>(listOne);newList.addAll(listTwo);

java list jdk1.5

You could use the Apache commons-collections library:

List<String> newList = ListUtils.union(list1, list2);

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