Java 21+ вводит упрощённый синтаксис: неявно объявленные классы и main без public static. Снижает барьер входа для обучения и скриптов.

Эволюция метода main
Full content is available with a subscription.
Get full access to all courses on the platform for one year with a single payment.
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.