Table Of Content
We're going to create a Shape interface and concrete classes implementing the Shape interface. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. These patterns control the way we define and design the objects, as well as how we instantiate them.
10 Null Object Method
The mediator works as a router between objects, and it can have its own logic to provide a way of communication. The prototype pattern is used when the Object creation is costly and requires a lot of time and resources, and you have a similar Object already existing. So this pattern provides a mechanism to copy the original Object to a new Object and then modify it according to our needs.
💡 Why Use the Factory Design Pattern?
Note that this pattern is also known as Factory Method Design Pattern. The Factory Design Pattern is a powerful technique for flexible object creation. By encapsulating the creation logic in a factory class, we achieve loose coupling and enhance the maintainability of our code. In the string conversion example, we demonstrated how the Factory Design Pattern allows us to switch between different conversion types easily.
The Solution — Factory Method:
If you still have some doubt on abstract factory design pattern in Java, please leave a comment. CarType will hold the types of car and will provide car types to all other classes. The solution is to reduce the code that constructs components across the framework into a single factory method and let anyone override this method in addition to extending the component itself. Based on the diagram above, let's go through the implementation of this design pattern together. Note that the parent class has been created, we can start creating the child classes.
Factory Method
Null Object Method is a Behavioral Design Pattern, it is used to handle the absence of a valid object by providing an object that does nothing or provides default behavior. FactoryPatternDemo, our demo class will use ShapeFactory to get a Shape object. It will pass information (CIRCLE / RECTANGLE / SQUARE) to ShapeFactory to get the type of object it needs. It's like a factory of factories which would, using the same approach, instantiate all spaceship-related factories with only a single new call at the start. Factory Pattern is one of the Creational Design pattern and it’s widely used in JDK as well as frameworks like Spring and Struts. Pranaya Rout has published more than 3,000 articles in his 11-year career.
Factory Design Pattern Implementation
We can’t add any new functionality to remove any existing behavior at runtime – this is when the decorator pattern is useful. Abstract Factory Method is a creational design pattern, it provides an interface for creating families of related or dependent objects without specifying their concrete classes. The Factory will be responsible for creating and instantiating the implementing class and giving it to the client program. Factory pattern uses reflections internally to instantiate the classes and doesn’t use new operator directly. The template method pattern is a behavioral design pattern and is used to create a method stub and to defer some of the steps of implementation to the subclasses. The template method defines the steps to execute an algorithm, and it can provide a default implementation that might be common for all or some of the subclasses.
That’s why we create a subclass for each dialog type and override their factory methods. The main idea is to define an interface or abstract class (a factory) for creating objects. Though, instead of instantiating the object, the instantiation is left to its subclasses. The Factory Method Pattern (also known as the Virtual Constructor or Factory Template Pattern) is a creational design pattern used in object-oriented languages. As you can see, the factory is able to return any type of car instance it is requested for.
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Advantages of Factory Method Design Pattern in Java
They help in organizing and managing relationships between objects to achieve greater flexibility, reusability, and maintainability in a software system. A Factory Pattern or Factory Method Pattern says that just define an interface or abstract class for creating an object but let the subclasses decide which class to instantiate. In other words, subclasses are responsible to create the instance of the class. Factory pattern introduces loose coupling between classes which is the most important principle one should consider and apply while designing the application architecture. Loose coupling can be introduced in application architecture by programming against abstract entities rather than concrete implementations.
The mediator design pattern is used to provide a centralized communication medium between different objects in a system. If the objects interact with each other directly, the system components are tightly-coupled with each other which makes maintainability cost higher and not flexible to extend easily. The mediator pattern focuses on providing a mediator between objects for communication and implementing loose-coupling between objects.
The command pattern is used to implement loose-coupling in a request-response model. In this pattern, the request is sent to the invoker and the invoker passes it to the encapsulated command object. The command object passes the request to the appropriate method of receiver to perform the specific action. An observer design pattern is useful when you are interested in the state of an Object and want to get notified whenever there is any change. In the observer pattern, the Object that watches the state of another Object is called observer, and the Object that is being watched is called subject.
DAO is a very popular pattern when we design systems to work with databases. The idea is to keep the service layer separate from the data access layer. The state design pattern is used when an Object changes its behavior based on its internal state. If we have to change the behavior of an Object based on its state, we can have a state variable in the Object and use if-else condition block to perform different actions based on the state. The state pattern is used to provide a systematic and loosely-coupled way to achieve this through context and state implementations.
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