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Title: Immutable map creation | java.evolved

Open Graph Title: Immutable map creation | java.evolved

X Title: Immutable map creation | java.evolved

Description: Create immutable maps inline without a builder.

Open Graph Description: Create immutable maps inline without a builder.

X Description: Create immutable maps inline without a builder.

Opengraph URL: https://javaevolved.github.io/collections/immutable-map-creation.html

direct link

Domain: javaevolved.github.io


Hey, it has json ld scripts:
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Links:

java.evolvedhttps://javaevolved.github.io/
https://github.com/javaevolved/javaevolved.github.io
← All patternshttps://javaevolved.github.io/
https://javaevolved.github.io/collections/immutable-list-creation.html
https://javaevolved.github.io/collections/immutable-set-creation.html
Homehttps://javaevolved.github.io/
Collectionshttps://javaevolved.github.io/#collections
🐛 Report a code issuehttps://github.com/javaevolved/javaevolved.github.io/issues/new?template=code-issue.yml&title=%5BCode%20Issue%5D%20Immutable%20map%20creation&category=collections&slug=immutable-map-creation
🌐 Report a translation issuehttps://github.com/javaevolved/javaevolved.github.io/issues/new?template=translation-issue.yml&title=%5BTranslation%5D%20Immutable%20map%20creation%20%28English%29&locale=en&pattern=immutable-map-creation&area=Pattern%20content
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🦋https://bsky.app/intent/compose?text=Immutable%20map%20creation%20%E2%80%93%20java.evolved%20https%3A%2F%2Fjavaevolved.github.io%2Fcollections%2Fimmutable-map-creation.html
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Let us know.https://github.com/javaevolved/javaevolved.github.io/issues/new?template=code-issue.yml&title=%5BCode%20Issue%5D%20Immutable%20map%20creation&category=collections&slug=immutable-map-creation
Map.of() ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/Map.html#of()
Map.ofEntries() ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/Map.html#ofEntries(java.util.Map.Entry...)
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/collections/ImmutableMapCreation.java
Collections Beginner Copying collections immutably Java 8 List copy = Collections.unmodifiableList( new ArrayList<>(original) ); Java 10+ List copy = List.copyOf(original); Hover to see modern ➜ JDK 10+ → https://javaevolved.github.io/collections/copying-collections-immutably.html
Collections Beginner Sequenced collections Java 8 // Get last element Object last = list.get(list.size() - 1); // Get first Object first = list.get(0); // Reverse iteration: manual Java 21+ var last = list.getLast(); var first = list.getFirst(); var reversed = list.reversed(); Hover to see modern ➜ JDK 21+ → https://javaevolved.github.io/collections/sequenced-collections.html
Streams Beginner Stream.toList() Java 8 List result = stream .filter(s -> s.length() > 3) .collect(Collectors.toList()); Java 16+ List result = stream .filter(s -> s.length() > 3) .toList(); Hover to see modern ➜ JDK 16+ → https://javaevolved.github.io/streams/stream-tolist.html
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