in which situation we use methods in java code example

Example 1: methods in java

A method in java is a group of statements to carry out some operation also 
known as functions.

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