Web Reference: Jan 9, 2024 · A quick and practical guide to creating collections and maps using Java 9 factory methods. Jul 23, 2025 · The JDK 9 has added static factory methods like of () onto basic Collection interfaces, to create unmodifiable collection objects. These are the same as the unmodifiable (immutable) collection we create in JDK 6, 7, 8. Jun 26, 2017 · Provide static factory methods on the collection interfaces that will create compact, unmodifiable collection instances. The API is deliberately kept minimal.
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