public class MainClass {
    public static void main(String[] args) {
        System.out.println("Hello World!"); // comment
        int num = 0;
        label: while (num <= 10) {
        ...
        }
    }
}

public class MainClass {
    public static void main(String[] args) {
        System.out.println("Hello World!"); //comment
        int num = 0;
label: while (num <= 10) {
        ...
        }
    }
}