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What is Dependency of Injection in Design Pattern?

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Design Patterns Explained: Dependency Injection With Code Examples

 by 

Thorben Janssen

 

 

 

 ·

 Jun. 20, 18 · Java Zone · Tutorial

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Dependency injection is a programming technique that makes a class independent of its dependencies. It achieves that by decoupling the usage of an object from its creation. This helps you to follow SOLID’s dependency inversionand single responsibility principles.

As I explained in my previous articles about the SOLID design principles, their goal is to improve the reusability of your code. They also aim to reduce the frequency with which you need to change a class. Dependency injection supports these goals by decoupling the creation of the usage of an object. That enables you to replace dependencies without changing the class that uses them. It also reduces the risk that you have to change a class just because one of its dependencies changed.

The dependency injection technique is a popular alternative to the service locator pattern. A lot of modern application frameworks implement it. These frameworks provide the technical parts of the technique so that you can focus on the implementation of your business logic. Popular examples are:

Weld, the reference implementation of Jakarta EE’s Context and Dependency Injection for Java (CDI) specificationSpringGuicePlay frameworkDagger