Java 21 Unnamed Classes and Instance Main Methods Tutorial (2026) Java 21 unnamed classes and instance main methods tutorial. Learn how to implement unnamed classes and instance main methods in Java 21. The release of Java 21 brings with it several exciting features, but one that stands out in particular is the introduction of unnamed classes and instance main methods. This feature solves a real problem that has plagued Java developers for years: the need for a separate main class to serve as the entry point for an application. With unnamed classes and instance main methods, developers can now create more concise and expressive code, streamlining their development process and reducing boilerplate. In traditional Java development, every application requires a public static main method to serve as the entry point. This has led to the creation of numerous "throwaway" classes, whose sole purpose is to provide a main method.…