Say goodbye to the public static void main method in Java 21 with the unnamed classes and instance main methods preview features.

The entry point of a standalone Java application is the main method or function. In the age of Servlets and JSPs, Java’s main function took a backseat to these technologies that were initialized with ...

However, they must contain a main method that can be launched, a requirement enforced by the Java compiler. This new feature allows developers to write programs without explicit class declarations.