December 27, 2021

Ifrah Khan


Design patterns in Java technology are every Java developer’s topic of interest. These design patterns are an industry-standard method that can help determine and fix repeating issues.  These patterns can be reused to create robust code. This, in turn, reduces the cost of programming. Apply design patterns in your next Java development project and reap the phenomenal benefits.

Benefits Of Design Patterns In Java:

Design patterns have three major benefits:
    • It improves the software development process.
    • Gives lucidity to the engineering frameworks.
    • It assists in communication and efficient software engineering for developers. 

Types Of Design Patterns:

There are various design patterns used in Java application development services. These can be classified under three major groups, namely creational, behavioral, and structural design patterns. Let us look at the idea of design patterns.

1. Creational Design Patterns

Singleton Pattern

The singleton pattern ensures that there is only one type of class with respect to the Java virtual machines. While it is an exceptionally straightforward and simple design, there are a lot of concerns about executing it.  The execution of the singleton pattern is not only a concern for individual engineers. It is also a questionable subject among Java software development companies. But yet, this is one of the most talked-about design patterns in Java.

Factory Pattern

In this design pattern, We need to return a sub-class when we have a superclass with many sub-classes and metadata. It is a design pattern that offers an abstract class for making an object and allows its subclasses to decide which class to be instantiated. This pattern is also classified as a creational pattern. In the Factory class, we can use a Singleton design or make the industrial facility technology static. The factory design pattern is one of the highly used patterns. Thus, engineers can consider the advantages of Factory Design Patterns, such as a program and manufacturing plant design.

Abstract Factory Pattern

The Abstract factory pattern solves issues where engineers create an entire range of product families without having to specify their classes. Client code only interacts with factories and products via abstract interfaces. This allows the client code to work with any of the factory object's product variants. Simply create a new concrete factory class and pass it along to the client code.

Builder Pattern

This creational pattern allows developers to construct complex objects of different types using the same construction code. However, this code necessitates time-consuming, step-by-step initialization of numerous fields and nested structures. The initialization code is normally tucked away with a slew of parameters. Or, even worse, strewn across the client code. 

Model Pattern

This design pattern is favored when object creation is an expensive affair. Object creation usually requires engineers to invest time and money. The model pattern uses a system where items are first duplicated to create a clone. Later, it can be changed as required.  The model pattern requires developers to give the Object being cloned a duplication highlight so that it does not get completed by some other class. However, whether to use the shallow or deep duplicate of the Object attributes depends on the requirements and is a design decision.

2. Structural Design Patterns

Adapter Pattern

The adapter pattern allows objects that are incompatible with each other to function together. This is possible with the help of an adapter that converts interfaces. This makes it easier for both objects to understand each other.

Bridge Pattern

A bridge is a structural design pattern that allows developers to partition a large class or a group of classes that are closely related to different hierarchies called abstraction and implementation, which can be developed separately.

Composite Pattern

The composite pattern enables developers to compose objects into tree-like diagrams. Then, each segment of the 'tree' can be worked on as if they were individual objects. However, using this pattern is recommended only when the core model of the app can be stacked like a tree.

Decorator Pattern

The decorator pattern enables developers to attach new behaviors to objects. This is possible as these objects are wrapped inside wrapper objects that contain behaviors.

Facade Pattern

The façade pattern provides simplified interfaces to libraries, frameworks, and other types of complex classes that require it. When compared to interacting directly with the subsystem, a facade may have limited capabilities. It does, however, only include the elements that clients care about. Having a facade comes in handy when you need to integrate your app with a complicated library with dozens of functions but only require a small portion of them.

Flyweight Pattern

Instead of retaining all of the data in each Object, users can fit more objects into the available RAM by sharing common bits of state between several objects. Hence, the flyweight pattern is a useful one. There also is a flyweight factory that manages many flyweight patterns simultaneously. Here, clients do not have to create flyweight patterns by themselves. Instead, they can call the factory and pass on the required information of the desired flyweight.  The factory then browsed the existing flyweight collection. It either responds with a flyweight matching the criteria or creates a brand new one. 

Proxy Pattern

The proxy pattern acts as a stand-in or placeholder for another object. A proxy manages access to the actual Object, allowing users to perform tasks before or after the request reaches the real Object.

3. Behavioural Design Pattern

Chain Of Responsibility Pattern

This pattern allows users to pass requests through a chain of handlers. Each handler can choose to process the request or pass it on to another.

Command Pattern

Requests transform into stand-alone objects here. With this transformation, method arguments, execution of requests can be passed.

Iterator Pattern

Iterator is a behavioral design pattern that allows you to traverse components of a collection without revealing any of its representations such as list, tree, stack.

Mediator Pattern

A mediator is a behavioral design that reduces dependencies between two or more objects. This pattern prevents the objects from communicating directly with one other, forcing them to collaborate only through a mediator object.

Memento Pattern

The memento pattern allows users to save as well as restore previous versions of the Object without revealing any details of the implementation.

Final Words

All the design patterns in Java have been clearly outlined here in great detail. If the users are not confident with coding and working with design patterns, they can hire a Java development company. These design patterns will help developers to plan the advancement of their product adequately.

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