Java 21: Sequenced collections (getFirst / getLast)

SequencedCollection adds first/last access and reversed() to ordered collections.

Code

List<String> list = new ArrayList<>(List.of("a", "b", "c"));
System.out.println(list.getFirst());
System.out.println(list.getLast());
System.out.println(list.reversed());

Output

a
c
[c, b, a]

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Published 2026-07-26