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What is the disadvantage of abstract factory?
3 Answers. Quoting from “Design Patterns” by GoF (kind of programmer bible): “Supporting new kinds of products is difficult. Extending abstract factories to produce new kinds of Products isn’t easy. That’s because the AbstractFactory interface fixes the set of products that can be created.
How factory method is different from Factory Method design pattern?
Factory Method – Defines an interface for creating objects, but let subclasses to decide which class to instantiate and Refers to the newly created object through a common interface. Abstract Factory – Offers the interface for creating a family of related objects, without explicitly specifying their classes.
Which is a drawback of factory method pattern?
One disadvantage of the Factory Method pattern is that it can expand the total number of classes in a system. Every concrete Product class also requires a concrete Creator class. The parameterized Factory Method avoids this downside.
What’s the difference between factory and abstract factory in Java?
Factory: Creates objects without exposing the instantiation logic to the client. Factory Method: Define an interface for creating an object, but let the subclasses decide which class to instantiate. The Factory method lets a class defer instantiation to subclasses
Why should I use factory class instead of direct object construction?
Case in point, by using “new” and a public constructor, you are coupling the calling code to a specific construction method of a specific concrete class. Your code now has to know that a class MyFooObject exists, and has a constructor that takes a string and an int.
When to use a factory instead of a constructor?
When initialization becomes more than assigning a few variables to the fields, a factory makes sense. Here are some of the benefits: Long, complicated code makes more sense in a dedicated class (a factory). If the same code is put in a constructor which calls a bunch of static methods, this will pollute the main class.
How to create a factory method in Java?
Factory Method – Instead of whole separate class for factory, just add one method in that class itself as a factory. Ex: Lets say we want to build factory for computer parts. So there are several types of computers like Laptop, Desktop, Server. So for each compter type we need factory. So we create one highlevel factory of factories like below