Web Reference: May 30, 2025 · In Java, immutability means that once an object is created, its internal state cannot be changed. Immutable classes in Java provide many advantages like thread safety, easy debugging and all. Convenience static factory methods on the List, Set, and Map interfaces, which were added in JDK 9, let you easily create immutable lists, sets, and maps. Introduction This tutorial explains how to use Java 9 Collections' new factory methods for creating immutable collection instances with examples to show their usage.
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