What is Abstract Factory pattern in Java?
Abstract Factory design pattern provides approach to code for interface rather than implementation. Abstract Factory pattern is “factory of factories” and can be easily extended to accommodate more products, for example we can add another sub-class Laptop and a factory LaptopFactory.
How does Abstract Factory pattern work?
This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. In Abstract Factory pattern an interface is responsible for creating a factory of related objects without explicitly specifying their classes.
Why do we need Abstract Factory pattern?
The purpose of the Abstract Factory is to provide an interface for creating families of related objects, without specifying concrete classes. This pattern is found in the sheet metal stamping equipment used in the manufacture of Japanese automobiles.
What is difference between factory pattern and Abstract Factory pattern?
Factory Method pattern is responsible for creating products that belong to one family, while Abstract Factory pattern deals with multiple families of products. Factory Method uses interfaces and abstract classes to decouple the client from the generator class and the resulting products.
Why is Factory Pattern used?
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 is it called factory 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.
What is difference between factory and Abstract Factory?
Java. 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 problem does Abstract Factory solve?
The Abstract Factory design pattern solves problems like: How can an application be independent of how its objects are created? How can a class be independent of how the objects it requires are created? How can families of related or dependent objects be created?
When should I use Abstract Factory?
When to Use Abstract Factory Pattern: The client is independent of how we create and compose the objects in the system. The system consists of multiple families of objects, and these families are designed to be used together. We need a run-time value to construct a particular dependency.
What are the types of Factory Pattern?
the abstract factory pattern,
the static factory method, the simple factory (also called factory).
Why do we use factory patterns?
What is difference between factory and abstract factory?
What are the types of factory pattern?
What is the benefit of factory 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.
What is a abstract class in Java?
Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class). Abstract method: can only be used in an abstract class, and it does not have a body. The body is provided by the subclass (inherited from).
What is builder class in Java?
Builder is a creational design pattern, which allows constructing complex objects step by step. Unlike other creational patterns, Builder doesn’t require products to have a common interface. That makes it possible to produce different products using the same construction process.
What are the consequences of the Abstract Factory pattern?
Consequences. The Abstract Factory pattern has the following benefits and liabilities: It isolates concrete classes. The Abstract Factory pattern helps you control the classes of objects that an application creates.
Is Singleton a factory?
As the above UML diagram shows, a singleton class has a single instance defined and we access it by the getInstance () method. So a singleton factory that is responsible for creating objects makes use of the getInstance method to return the same object (which is there in the class) again and again.
Which are the three types of factory method?
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.
What is abstraction in OOP?
What is Abstraction in OOP? Abstraction is the concept of object-oriented programming that “shows” only essential attributes and “hides” unnecessary information. The main purpose of abstraction is hiding the unnecessary details from the users.
What is abstract class in OOP?
An abstract class is a class that contains at least one abstract method. An abstract method is a method that is declared, but not implemented in the code.
What is immutable class in Java?
Immutable class in java means that once an object is created, we cannot change its content. In Java, all the wrapper classes (like Integer, Boolean, Byte, Short) and String class is immutable.
How can Singleton be broken?
Suppose you serialize an object of a singleton class. Then if you de-serialize that object it will create a new instance and hence break the singleton pattern.