To you who lament that Java's main method is static

Motivation

You may write a simple program from the main method with a little operation check. Now that I have JShell, I may not have many opportunities to do that. (Which one)

Anyway, since the main method is static, it's a story when you want to do something troublesome.

things to do

You can create your own instance with the main method and execute the instance method.

Main.java

public class Main {
    public static void main(String[] args) {
        new Main().execute();
    }
}

public void execute() {
    ...
}

Digression

In the case of competitive programming, if you prepare a template that describes the pre-processing and post-processing and the call of the instance method for implementation in the main method, something will be done.

For example, I am making a template like this.

Template excerpt

public class Main {
    public static void main(String[] args) {
        PrintWriter out = new PrintWriter(System.out);
        InputStreamScanner in = new InputStreamScanner(System.in);
        new Main().solve(in, out);
        out.flush();
    }

    private void solve(InputStreamScanner in, PrintWriter out) {
        in.nextInt();

        out.println();
    }
//(Hereafter, implementation of self-made Scanner)

There are various styles in this area depending on the person, so I think you should refer to the source code of various competitive professionals.