Java 21's New Feature: Unnamed Patterns and Variables Explained

Java 21 introduces 'Unnamed Patterns and Variables', a feature that simplifies coding by allowing the use of unnamed variables in pattern matching. By utilizing an underscore, devs can selectively ignore variables within a pattern. This is particularly useful for reducing code in situations like destructuring record components or handling switch expressions where certain vars are not needed. The key advantage is enhanced code readability and maintainability, as it allows devs to concentrate on relevant data. This results in a more streamlined and elegant expression of complex logic, particularly in data processing and control flow scenarios.

This example showcases 'Unnamed Patterns and Variables' in Java 21. It features a 'Person' record, illustrating unnamed patterns in record destructuring and switch expressions. The code selectively extracts 'age' and 'name', shows the feature's effectiveness in streamlining code by omitting irrelevant fields.