Instance main methods and unnamed classes are a preview feature in Java 21. Other Java 21 preview features preview features include the following: Unnamed patterns and variables. Scoped values.

Unnamed Classes and Instance Main Methods, which is also in preview, simplifies the introduction to Java for new programmers by allowing student-built programs to be compiled and run without a ...

HelloWorld application in Java. To write a modern, standalone Java application that uses Java 21’s unnamed classes and instance main method features, the full code is as follows:. void main() {System.

Java would become easier for students to learn under a proposal to introduce flexible main methods and anonymous main classes to the language. This is a preview language feature, disabled by ...