About this kata
This kata refers to the book Effective Java by Joshua Bloch. It addresses
Item 1: Consider static factory methods instead of constructors.
Problem description
Provid a class that Use factory method to construct an instance by a good understandable name. The instance shall be only created when there is no existing one.
advantages of factory method usage instead of constructors:
- Unlike constructors the method has a meaningful name.
- Unlike constructors it is not required to create a new object each time they are invoked.
- Unlike constructors it can return an object of any subtype of their return type.
- The returned object can vary from call to call as function of the input parameters.
- The class of the returned object need not exist when the class containing the method is written. ????