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Dependency Injection (DI) is a design pattern used to implement IoC (Inversion of Control), allowing the creation of dependent objects outside of a class and providing those objects to a class in various ways. Spring Framework provides comprehensive support for DI, making it easier to manage dependencies and promote loose coupling between classes.
Types of Dependency Injection in Spring
1. Constructor Dependency Injection (CDI)
Constructor DI involves injecting dependencies through a class constructor. This method is preferred when the dependencies are mandatory and should be provided at the time of object creation.
Example:
package com.example;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;@Componentpublic class Vehicle {private Engine engine;@Autowiredpublic Vehicle(Engine engine) {this.engine = engine;}public void start() {engine.run();}}@Componentpublic class Engine {public void run() {System.out.println("Engine is running...");}}Copied!✕Copy Spring Dependency Injection Example with Annotations
Jun 24, 2019 · This Spring tutorial helps you understand how to use Java annotations to configure dependency injection for classes in an application. Besides using XML for dependency injection …
Java Dependency Injection with Annotations | Medium
Apr 15, 2023 · One common approach to implementing dependency injection in Java is through the use of annotations. In this article, we will explore the basics …
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How to use the @Inject attribute in Java - Educative
When a class or field is annotated with @Inject, the dependency injection framework automatically identifies the required dependencies and provides the instance. @Inject allows for a more modular …
Spring Core Annotations - GeeksforGeeks
Nov 8, 2025 · In essence, annotations tell the Spring Container how to create, configure, and manage application components (beans). They are widely used …
Wiring in Spring: @Autowired, @Resource and @Inject - Baeldung
May 11, 2024 · This article will compare and contrast the use of annotations related to dependency injection, namely the @Resource, @Inject, and @Autowired annotations.
Java @Named and @Inject Annotations in Spring
Dec 18, 2024 · On this page, we will provide Java @Named and @Inject JSR 330 annotation example. JSR 330 provides dependency injection with @Inject and …
Java Injection: Concepts, Usage, and Best Practices
Nov 12, 2025 · Annotations are widely used in Java injection. In addition to the ones shown above, frameworks like Spring use annotations like @Autowired for automatic dependency injection.
How to Implement Dependency Injection Using Annotations in Java
Learn how to use annotations for Dependency Injection in Java for better code management and testing.
How do I define and inject dependencies using annotations in Spring ...
May 6, 2025 · In Spring, you can define and inject dependencies using annotations, which simplifies the process of configuring beans and their relationships. Here’s how you can do it step by step:
Creating a Mini Dependency Injection Container with …
Sep 15, 2025 · Learn how to build a mini dependency injection container in Java using annotations and reflection. Includes examples, pitfalls, and best practices. …
Deep dive into Dependency Injection in Java in Java with Annotation
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