How Can I Efficiently Combine Two Java Lists into a New One?

Joining Lists in Java

You have two lists, listOne and listTwo, and you want to combine them into a new list newList without modifying the originals. The current approach using addAll() is straightforward but verbose.

Java 8 Streaming

For a more concise solution, consider using Java 8 streams. The concat() method lets you merge two streams, and collect() can convert the merged stream back into a list:

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

Java 16 List Factory Method

In Java 16 and above, the toList() method can be simplified further:

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

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