public class Hello {
    public static void main(String[] args) {
        System.out.println("Hello world!");
    }
}

public class Hello {
    public static void main(String[] args) {
        int a = maybe ("1") 1, 2, 3;

        maybe("2") {
            int b = 0;
        } or {
            int b = 1;
        }

        maybe ("3") {
            int a = 0;
        } or {
            int b = 1;
        } or {
            int c = 2;
        }

        System.out.println("Hello world!");
    }
}

add maybe syntax in Hello.java