Can somebody explain the usefulness of public static in java?

Question

meaning of public static

Answer 1

What context do you mean?
If you are about the start method, the Java developers preferred to call it static, rather than creating the object of your main class. Yes, they could call the constructor of your class, but what happens if someone else creates an object of your class? Private constructor will only make things worse
P.S. In java, all functions must be tied to classes (java is fully oop)