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Title: Sequenced collections | java.evolved

Open Graph Title: Sequenced collections | java.evolved

X Title: Sequenced collections | java.evolved

Description: Access first/last elements and reverse views with clean API methods.

Open Graph Description: Access first/last elements and reverse views with clean API methods.

X Description: Access first/last elements and reverse views with clean API methods.

Opengraph URL: https://javaevolved.github.io/collections/sequenced-collections.html

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Domain: javaevolved.github.io

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Links:

java.evolved	https://javaevolved.github.io/
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← All patterns	https://javaevolved.github.io/
←	https://javaevolved.github.io/collections/map-entry-factory.html
→	https://javaevolved.github.io/collections/collectors-teeing.html
Home	https://javaevolved.github.io/
Collections	https://javaevolved.github.io/#collections
🐛 Report a code issue	https://github.com/javaevolved/javaevolved.github.io/issues/new?template=code-issue.yml&title=%5BCode%20Issue%5D%20Sequenced%20collections&category=collections&slug=sequenced-collections
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Let us know.	https://github.com/javaevolved/javaevolved.github.io/issues/new?template=code-issue.yml&title=%5BCode%20Issue%5D%20Sequenced%20collections&category=collections&slug=sequenced-collections
Sequenced Collections (JEP 431) ↗	https://openjdk.org/jeps/431
SequencedCollection ↗	https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/SequencedCollection.html
View proof source ↗	https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/collections/SequencedCollections.java
Collections Intermediate Collectors.teeing() Java 8 long count = items.stream().count(); double sum = items.stream() .mapToDouble(Item::price) .sum(); var result = new Stats(count, sum); Java 12+ var result = items.stream().collect( Collectors.teeing( Collectors.counting(), Collectors.summingDouble(Item::price), Stats::new ) ); Hover to see modern ➜ JDK 12+ →	https://javaevolved.github.io/collections/collectors-teeing.html
Collections Beginner Immutable set creation Java 8 Set set = Collections.unmodifiableSet( new HashSet<>( Arrays.asList("a", "b", "c") ) ); Java 9+ Set set = Set.of("a", "b", "c"); Hover to see modern ➜ JDK 9+ →	https://javaevolved.github.io/collections/immutable-set-creation.html
Collections Beginner Immutable map creation Java 8 Map map = new HashMap<>(); map.put("a", 1); map.put("b", 2); map.put("c", 3); map = Collections.unmodifiableMap(map); Java 9+ Map map = Map.of("a", 1, "b", 2, "c", 3); Hover to see modern ➜ JDK 9+ →	https://javaevolved.github.io/collections/immutable-map-creation.html
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