🚗 Spring Core – Car Engine Application (Java Config)

A simple Spring Core Maven project demonstrating Dependency Injection (DI) and Inversion of Control (IoC) using Java-based configuration and annotations.

This project explains how Spring manages object creation and dependency wiring without XML configuration.

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📌 Project Overview

In this application, a Car depends on an Engine interface.
Different engine implementations (PetrolEngine, DieselEngine) are injected into the Car class using Spring's annotation-based configuration.

The project focuses on:

• Loose coupling
• Clean architecture
• Spring Core fundamentals

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🛠️ Technologies Used

• Java 11
• Spring Core (Context)
• Maven
• Eclipse IDE

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📂 Project Folder Structure

spring-core-car-engine-app
│
├── src
│   ├── main
│   │   ├── java
│   │   │   └── com/springcore
│   │   │       ├── car
│   │   │       │   └── Car.java
│   │   │       │
│   │   │       ├── engine
│   │   │       │   ├── Engine.java
│   │   │       │   ├── PetrolEngine.java
│   │   │       │   └── DieselEngine.java
│   │   │       │
│   │   │       ├── config
│   │   │       │   └── AppConfig.java
│   │   │       │
│   │   │       └── main
│   │   │           └── MainApp.java
│   │   │
│   │   └── resources
│   │
│   └── test
│       └── java
│
├── screenshots
│   └── output.png
│
├── README.md
├── .gitignore
└── pom.xml

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⚙️ Core Concepts Demonstrated

• Dependency Injection (DI)
• Inversion of Control (IoC)
• Interface-based design
• Annotation-based configuration
• Java-based Spring configuration (@Configuration)
• Component scanning (@ComponentScan)
• Bean injection (@Autowired)

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🔄 Application Flow

1. Application starts from MainApp
2. Spring container is initialized using AnnotationConfigApplicationContext
3. AppConfig scans all components
4. Car bean is created
5. Engine implementation is injected automatically
6. Engine starts and car runs

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▶️ How to Run the Project

1. Clone the repository:

   git clone: https://github.com/mkmishra2503/spring-core-car-engine-app.git

2.Open the project in Eclipse
3.Make sure Java 11 is configured
4.Run: MainApp.java

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📸 Output Screenshot

Below is the console output of the application after running MainApp.java:

(Output may vary based on injected engine implementation)

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🎯 Learning Purpose

• This project is created to:
• Understand Spring Core fundamentals
• Learn annotation-based configuration
• Practice clean and modular Java code
• Prepare for Java & Spring interviews

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👨‍💻 Author

Mithilesh Kumar Mishra
Java Developer | Spring Framework Learner

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⭐ Support

⭐ If you found this project helpful, please give it a star to support and encourage my learning journey.