How do I join two lists in Java

0 votes

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);

Dec 30, 2020 in Java by Rajiv
• 8,880 points
36 views

1 answer to this question.

0 votes

In Java 8:

List<String> newList = Stream.concat(listOne.stream(), listTwo.stream())
                             .collect(Collectors.toList());
answered Dec 30, 2020 by Gitika
• 65,870 points

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