Let says I have two arraylists:
List<String> arr = new ArrayList<>(); arryOne.add("Huey"); arryOne.add("Dewey"); arryOne.add("Louie"); List<String> arryTwo = new ArrayList<>(); arryTwo.add("Dewey"); arryTwo.add("Stuie");
Is there some convenient API or relatively simple way to add “Stuie” to arryOne while ignoring the redundant “Dewey” element?
I am sure I can brute force perform the add/ignore but was hoping someone might know of a convenience means through collections API or similar to do this in just a few lines of code. Thanks!
There isn’t, because List is a datatype that more or less explicitly means: Can contain duplicates.
In other words, List, if anything, has baked in that the second
Dewey is not redundant:
should result in:
[Huey, Dewey, Louie, Dewey, Stuie].
Other data types are what you need. For example, a LinkedHashSet:
var set = new LinkedHashSet<String>(); var arr1 = List.of("Huey", "Dewey", "Louie"); var arr2 = List.of("Dewey", "Stuie"); set.addAll(arr1); set.addAll(arr2); System.out.println(set); > [Huey, Dewey, Louie, Stuie]