Answers for "static methods"

What is the difference between static (class) method and instance method?

static or class method
1) A method that is declared as static is known as the static method
2) We don't need to create the objects to call the static methods
3) Non-static (instance) members cannot be accessed in static context 
(static method, static block and static nested class) directly.
4) For example: public static int cube(int n){
return n*n*n*; (multiply *) }

Instance method
1) A method that is not declared as static is known as the instance method.
2) The object is required to call the instance method.
3) Static and non-static variables both can be accessed in instance methods.
4) For example: public void msg() {
...}.

static methods

class Repo {
  static getName() {
    return "Repo name is modern-js-cheatsheet"
  }
}

// Note that we did not have to create an instance of the Repo class
console.log(Repo.getName()) // Repo name is modern-js-cheatsheet

let r = new Repo();
console.log(r.getName()) // Uncaught TypeError: r.getName is not a function

what is static method

A static method belongs to the class rather than the object.
There is no need to create the object to call the static methods.
A static method can access and change the value of the static variable

static methods and variables

The methods or variables defined as static are shared among all the objects 
of the class. The static is the part of the class and not of the object. 
The static variables are stored in the class area, and we do not need 
to create the object to access such variables. 
Therefore, static is used in the case, where we need to define 
variables or methods which are common to all the objects of the class.
For example, In the class simulating the collection of the students in 
a college, the nameof the college is the common attribute to all the students.
Therefore, the college name will be defined asstatic

do i have to use static methods in java main

Use a static method 
when you want to be able to access the method 
without an instance of the class