Explain Dependency Injection in Spring with an example.
Best Full Stack Java Training Institute in Hyderabad with Live Internship Program
Are yu aiming to build a strong foundation in software development and land your dream job in the IT industry? Look no further than Quality Thought, the best Full Stack Java training institute in Hyderabad, known for its industry-focused training and valuable live internship program.
Quality Thought’s Full Stack Java course is designed for both beginners and professionals who want to master the skills required to develop real-world web applications. The course covers everything from Core Java, Advanced Java, JDBC, Servlets, JSP, Spring, Spring Boot, Hibernate, to front-end technologies like HTML, CSS, JavaScript, Bootstrap, Angular, and React.
What makes this training truly effective is the live internship, which provides hands-on experience on real-time projects. Students work in a simulated industry environment, dealing with actual coding tasks, debugging, deployment, version control, and team collaboration. This practical exposure helps learners build confidence and problem-solving skills—critical assets in any software job.
Program Highlights:
Comprehensive Full Stack Java Curriculum
Real-Time Projects with Live Internship
Mentorship from Industry Experts
Daily Practice, Assignments & Project Work
Resume Preparation, Mock Interviews & Placement Assistance
Internship Certificate & Career Guidance
Whether you're a fresher just out of college or a working professional planning a career switch, Quality Thought offers the best platform to become a skilled Full Stack Java Developer. With a focus on practical learning and job readiness, many of our students are now placed in top IT companies across India.
Join Quality Thought today – Get trained, get certified, gain real-world experience, and step confidently into the IT industry!
Dependency Injection (DI) in Spring is a design pattern where the objects that a class depends on are provided externally rather than the class creating them itself. This promotes loose coupling, easier testing, and better maintainability. In traditional programming, a class creates its own objects, which tightly couples it to specific implementations. With DI, Spring takes responsibility for creating and managing these dependencies, and injects them into the required classes.
In Spring, DI can be achieved in two main ways:
-
Constructor Injection – Dependencies are passed as parameters to the class constructor. This is recommended because it ensures that all required dependencies are available at object creation.
-
Setter Injection – Dependencies are provided through setter methods after the object is created. This is flexible and allows optional dependencies.
Spring’s IoC (Inversion of Control) container manages these dependencies. Developers simply declare beans (objects) and their relationships in configuration (XML, Java annotations, or Java-based config). Spring then wires everything automatically.
Example scenario (conceptual, without code):
Imagine a Car class that needs an Engine to run. Without DI, the Car would create its own Engine, which makes it hard to replace with a different type of engine (say, petrol or electric). With DI, the Car only declares that it needs an Engine, but does not say how to create it. Spring provides the right engine (petrol, diesel, or electric) based on configuration.
This way, if you later want to change the engine type, you only adjust the configuration, not the Car class code.
✅ In summary: Dependency Injection in Spring allows developers to focus on defining what dependencies are needed, while Spring handles how they are created and supplied, resulting in cleaner, modular, and easily testable code.
Read More :
Comments
Post a Comment