Web Reference: Sep 17, 2023 · Java 21 is the first Java release with all essential pattern matching features finalized: sealed types, type patterns, an improved switch, records, and record patterns. This tutorial puts them all together. Mar 25, 2026 · This blog post aims to provide a comprehensive overview of Java 21 pattern matching, including fundamental concepts, usage methods, common practices, and best practices. Pattern matching involves testing whether an object has a particular structure, then extracting data from that object if there's a match. You can already do this with Java.
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