java why is main method static code example

Example 1: why main method static

Because the object is not required to call the static method. 
If we make the main method non-static, 
JVM will have to create its object first and then call main() method which 
will lead to the extra memory allocation.

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