how does a factory design pattern work

How does Factory Design Pattern Work?

Full Answer

What is the use of factory pattern?

Factory pattern is one of the most used design patterns in Java. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface ...

What is factory design pattern in Salesforce?

As per the definition of Factory Design Pattern, the Factory Design Pattern create an object without exposing the object creation logic to the client and the client refers to the newly created object using a common interface. Please have a look at the following image.

What is the use of InFactory pattern?

In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface.

What is factory method in Salesforce?

The factory method is a creational design pattern, i.e., related to object creation. In the Factory pattern, we create objects without exposing the creation logic to the client and the client uses the same common interface to create a new type of object.

What is the Factory Method design pattern?

The factory method is a creational design pattern, i.e., related to object creation. In the Factory pattern, we create objects without exposing the creation logic to the client and the client uses the same common interface to create a new type of object.

How do you do factory patterns?

0:447:44How to Make a Repeat Pattern (Advanced PS) - YouTubeYouTubeStart of suggested clipEnd of suggested clipCut the paper from the middle. Now remember which pieces which then move them to opposite. PlacesMoreCut the paper from the middle. Now remember which pieces which then move them to opposite. Places the upper left corner goes to down right and up right to down left. Take them together and boy.

How does factory pattern work in Java?

The factory design pattern says that define an interface ( A java interface or an abstract class) for creating object and let the subclasses decide which class to instantiate. The factory method in the interface lets a class defers the instantiation to one or more concrete subclasses.

What problem does factory pattern solve?

The factory pattern aims to solve a fundamental problem in instantiation – i.e., the creation of a concrete object of a class – in object-oriented programming. In principle, creating an object directly within the class that needs or should use this object is possible, but very inflexible.

How do you make a pattern by hand?

0:337:08Making a Repeat Pattern by Hand - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe important thing when making a repeating pattern though is to make sure you don't go up to orMoreThe important thing when making a repeating pattern though is to make sure you don't go up to or over the edge of the page. You can go really near to it.

How do you explain patterns to kindergarten?

Here are a few ways you can help your child learn to see even more patterns in everyday life:Read books and sing songs that have repetition. Patterns can be comforting to young children. ... Describe your child's actions to them. ... Create a pattern and have them copy it. ... Go on a nature walk. ... Think outside the box.

What is Factory Design Pattern with real time example?

The Factory Design Pattern is a commonly used design pattern where we need to create Loosely Coupled System. Basically, it comes under Creational Pattern and it is used to create instance and reuse it. Factory Pattern is based on real time factory concept.

Why do we use Factory Design Pattern?

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.

Why factory method is static?

The constructors are marked private, so they cannot be called except from inside the class, and the factory method is marked as static so that it can be called without first having an object.

Why it is called factory pattern?

In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created.

Which are the three types of factory method?

the abstract factory pattern, the static factory method, the simple factory (also called factory).

What is factory used for?

A factory, manufacturing plant or a production plant is an industrial facility, often a complex consisting of several buildings filled with machinery, where workers manufacture items or operate machines which process each item into another.

Which are the three types of Factory Method?

the abstract factory pattern, the static factory method, the simple factory (also called factory).

What is the Factory pattern used for?

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.

How do you implement a strategy pattern?

Design Patterns - Strategy PatternCreate an interface. Strategy.java public interface Strategy { public int doOperation(int num1, int num2); }Create concrete classes implementing the same interface. ... Create Context Class. ... Use the Context to see change in behaviour when it changes its Strategy. ... Verify the output.

What is factory pattern in Android?

Factory Pattern, as the name implies uses factory methods to handle the problem of having to create multiple objects without specifying the exact class of object that will be created.

Implementation

We're going to create a Shape interface and concrete classes implementing the Shape interface. A factory class ShapeFactory is defined as a next step.

Step 3

Create a Factory to generate object of concrete class based on given information.

Step 4

Use the Factory to get object of concrete class by passing an information such as type.

When to use the Factory Design Pattern?

The Factory Design Pattern allows you to separate the object construction code from the code that actually uses the object. This makes it easier to extend the object construction code, independently from the rest of the code!

How to use factory pattern?

Use the Factory Pattern when: 1 you don’t know ahead of time what class object you might need 2 you don’t want the client to know every type of possible subclass 3 you want to centralize class selection 4 you want to encapsulate object creation 5 all the possible classes inherit from a common super class

What is a deque in a stack?

A Deque is a double ended queue. It can be used as a Queue or a Stack If you've studied your basic Data Structures and Algorithms, then I'm sure you're familiar with the Queue and the Stack data...

How does factory pattern work?

The factory pattern aims to solve a fundamental problem in instantiation – i.e., the creation of a concrete object of a class – in object-oriented programming. In principle, creating an object directly within the classthat needs or should use this object is possible, but very inflexible. It binds the class to this object and makes it impossible to change the instantiation independently of the class. This kind of code is avoided in the factory pattern approach by first defining a separate operationfor creating the object – the factory method. As soon as this is called up, it generates the object instead of the class constructor already mentioned.

Why is factory pattern important?

The factory pattern can prove valuable in various application scenarios. Software where the concrete products to be created are unknownor are not defined in advancebenefits from the alternative approach for subclass management . Typical use cases include frameworksor class libraries, which have become virtually indispensable as a basic framework for the development of modern applications.

What is the goal of the factory method pattern?

The factory pattern aims to solve a fundamental problem in instantiation – i.e., the creation of a concrete object of a class – in object-oriented programming. In principle, creating an object directly within the class that needs or should use this object is possible, but very inflexible. It binds the class to this object and makes it impossible to change the instantiation independently of the class. This kind of code is avoided in the factory pattern approach by first defining a separate operation for creating the object – the factory method. As soon as this is called up, it generates the object instead of the class constructor already mentioned.

What is factory method in software?

In software that is based on the factory method design pattern, the code of an object to be created (in this context also referred to as the “product”) is outsourced into a separate class . This abstract class, also called the “creator” or – matching the pattern – “factory”, delegates the object instantiation to a subclass (ConcreteCreator), which ultimately decides which product is created. For this purpose, the ConcreteCreator takes over the method createProduct () and returns a ConcreteProduct, which can optionally be extended by the Creator with production code before it is passed to the interface as a finished product.

What programming language is factory method?

Some of the best-known representatives include Java, JavaScript, C++, C#, Python, and PHP. The latter scripting language is also used in the following practical example, which is inspired by a German blog post by Phpmonkeys.

What are the advantages of factory design pattern?

Authentication systems also benefit from the advantages of the factory design pattern: Instead of a central class with various parameters that vary according to user authorization, the authentication process can be delegated to factory classes that make independent decisions about the handling of the respective user.

What is the factory method?

Among the many design strategies taught in this publication is the so-called factory method, which allows a class to delegate the creation of objects to subclasses. Concrete information on how to use this practical method is provided in particular by the factory method pattern, which is often today simply referred to as the factory pattern.

What is a factory design pattern?

As per the definition of Factory Design Pattern, the Factory Design Pattern create an object without exposing the object creation logic to the client and the client refers to the newly created object using a common interface.

What is a factory in Lehman's perspective?

From Lehman’s point of view, we can say that a factory is a place where products are created. In order words, we can say that it is a centralized place for creating products. Later, based on the order received, the appropriate product is delivered by the factory. For example, a car factory can produce different types of cars. If you are ordering a car to the car factory, then based on your requirements or specifications, the factory will create the appropriate car and then delivered that car to you.

What is a factory in Gang of Four?

According to Gang of Four, the Factory Design Pattern states that “A factory is an object which is used for creating other objects”. In technical terms, we can say that a factory is a class with a method. That method will create and return different types of objects based on the input parameter, it received.

Can a car factory produce a car?

For example, a car factory can produce different types of cars. If you are ordering a car to the car factory, then based on your requirements or specifications, the factory will create the appropriate car and then delivered that car to you. The same thing also happens in the factory design pattern.