So far, we have seen that the Spring container takes care of creating the instances of bean. In some scenarios, you need to take control of creating an instance of bean with custom code. Spring supports this feature with the help of the factory method.
You can write your custom logic to create the instance in the factory method, and just instruct Spring to use it. When Spring encounters such instructions, it will call the factory method to create the instance. So, the factory method is kind of a callback function.
There are two flavors of the factory method: static, and instance (non-static).
