> And you still need a wrapper class with a static method main in it One of the preview features he's using is JEP 445[1] that allows you to omit the wrapper c

> And you still need a wrapper class with a static method main in it One of the preview features he's using is JEP 445[1] that allows you to omit the wrapper class, as well as the arguments to main and the public and static modifiers. [1]https://openjdk.org/jeps/445 https://openjdk.org/jeps/445