When should we use factory pattern?

The Factory Method pattern is generally used in the following situations: A class cannot anticipate the type of objects it needs to create beforehand. A class requires its subclasses to specify the objects it creates. You want to localize the logic to instantiate a complex object.

Is the Factory pattern useful if so how?

Advantage of Factory Design Pattern Factory Method Pattern allows the sub-classes to choose the type of objects to create. It promotes the loose-coupling by eliminating the need to bind application-specific classes into the code.

What are the consequences of applying the factory method pattern?

Here are two additional consequences of the Factory Method pattern:

Provides hooks for subclasses. Creating objects inside a class with a factory method is always more flexible than creating an object directly.
Connects parallel class hierarchies.

What is the point of factory pattern?

The stated purpose of the Factory Patterns is: Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.

What is difference between factory method and prototype design pattern?

Factory pattern is used to introduce loose coupling between objects as the factory will take care of all the instantiation logic hiding it from the clients. Prototype pattern on the other hand is used when the cost of creating an object is large and it is ok to copy an existing instance than creating a new instance.

What is the Factory Method patterns explain with examples?

Example. The Factory Method defines an interface for creating objects, but lets subclasses decide which classes to instantiate. Injection molding presses demonstrate this pattern. Manufacturers of plastic toys process plastic molding powder, and inject the plastic into molds of the desired shapes.

What is difference between factory pattern and abstract factory pattern?

The main difference between a “factory method” and an “abstract factory” is that the factory method is a single method, and an abstract factory is an object. The factory method is just a method, it can be overridden in a subclass, whereas the abstract factory is an object that has multiple factory methods on it.

What is factory pattern in Python?

Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes. Factory Method defines a method, which should be used for creating objects instead of direct constructor call ( new operator).

What are the advantages of the facade pattern?

Facade pattern: advantages and disadvantages

Advantages	Disadvantages
Minimizes complexity of sub-systems	Complex implementation (especially with existing code)
Aids principle of loose coupling	Approach is coupled to an additional level of indirection

When do you use a factory design pattern?

Factory design pattern is probably one of the most used design patterns. If you have ever cared about doing low level object model properly for your service or if you have ever studied design patterns, it’s highly probable that you have incurred some scenario where you can use Factory pattern.

Is it bad to use factory patterns in coding?

Though this article is about factory patterns, using patterns just for using patterns is worst than never using them. This behaviour is an anti-pattern. Indeed, most patterns make the code more difficult to understand. Most of the time, I don’t use factories.

Is there a simple factory pattern in Java?

The first time I read this pattern, I misinterpreted it with the static one which was described by Joshua Bloch – one of the main architects of the Java APIs – in his book “Effective Java “. The simple factory (sometimes called factory) is informal but appears many times on the net.

When to use a non static factory pattern?

Still, you can use this pattern in its non-static form if your factory method needs some instances to work. For example, if you need a database connection, you could first instanciate your factory (that would instanciate the database connection) and then use the factory method that requieres this connection.

When should we use factory pattern?