How do I join two lists in Java?

2018-06-29 12:26:01

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:

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

在我头顶，我可以缩短一行：

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

在Java 8中：

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

你可以使用Apache commons-collections库：

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

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