when to use a static method java code example

Example 1: why we use static in java

In Java, static keyword is mainly used for memory management.
It can be used with variables, methods, blocks and nested classes.
It is a keyword which is used to share the same variable or method of a given
class. Basically, static is used for a constant variable or a method
that is same for every instance of a class

Example 2: 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