java which method to use and when code example

Example 1: what is method in java

Method is a collection of statements
which returns a value upon its execution.
  Method have a return and the method's name may or not be same as the class
name.
Method is invoked explicitly.
Method is not provided by compiler in any case.
Methods are inherited by child classes.

Example 2: what are method in java

Static methods: A static method is a method that can be called and executed without creating an object
Instance methods: These methods act upon the instance variables of a class
Factory methods: A factory method is a method that returns an object to the class to which it belong