Vehicle-Management-System

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🚗 Vehicle Management System (Java OOP Project)

A Java program that demonstrates Object-Oriented Programming concepts using an inheritance hierarchy of vehicles. The project models different types of vehicles (Car, Motorcycle, Truck) using abstraction, inheritance, method overriding, and polymorphism.

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✨ Features

• Abstract Base Class (Vehicle): Defines common properties (brand, model) and shared behavior.

• Child Classes (Car, Motorcycle, Truck): Each vehicle type extends the base class and provides its own behavior.

• Method Overriding: Child classes override methods like startEngine() and displayInfo().

• Polymorphism (Run-time): A list of Vehicle objects can store different types of vehicles. The JVM automatically selects the correct method implementation at runtime.

• Encapsulation & Constructor Chaining: Uses super() to initialize parent class attributes.

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📂 Project Structure

VehicleManagementSystem/
│── Vehicle.java          # Abstract parent class
│── Car.java              # Child class extending Vehicle
│── Motorcycle.java       # (Optional) Child class extending Vehicle
│── Truck.java            # (Optional) Child class extending Vehicle
│── VehicleManager.java   # Main class demonstrating polymorphism

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🧩 Code Summary

1. Vehicle.java (Parent Abstract Class)

• Contains common fields: brand, model
• Provides shared methods: displayInfo(), stopEngine()
• Declares abstract method: startEngine() (must be overridden)

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2. Car.java (Child Class Example)

• Extends Vehicle
• Adds unique field: numberOfDoors
• Implements startEngine() using its own behavior
• Overrides displayInfo() to show extra details
• Adds a child-specific method: openTrunk()

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3. VehicleManager.java (Main Program)

• Creates a list of type Vehicle

• Stores Car objects inside it (and can store Motorcycle, Truck, etc.)

• Demonstrates dynamic method dispatch

• Calls:

  • displayInfo() → overridden version
  • startEngine() → polymorphic version
  • stopEngine() → inherited version

• Shows how to call child-specific methods using casting

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▶️ How to Run

1. Compile all Java files

javac *.java

2. Run the main program

java VehicleManager

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📝 Example Output

--- 🌍 Vehicle Management System Demo ---
--- Vehicle Information ---
Brand: Toyota
Model: Camry
Doors: 4
**Car Engine Started:** The Toyota Camry key is turned.
Toyota Camry engine stopped.
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Toyota Camry trunk is open.

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🎯 OOP Concepts Demonstrated

Concept	Explanation	Where Used
Inheritance	Child classes reuse attributes & methods from parent	class Car extends Vehicle
Abstract Class	Base class with common code + abstract behavior	Vehicle
Method Overriding	Child provides custom behavior	Car.startEngine()
Polymorphism	Parent reference → Child object	List<Vehicle> vehicles
Dynamic Dispatch	JVM selects method at runtime	v.startEngine() inside loop
Encapsulation	Fields hidden, accessed through constructor	brand, model

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📌 Future Enhancements

• Implement full versions of Motorcycle and Truck
• Add fuel type, engine CC, load capacity, etc.
• Add interactive menu for adding/removing vehicles
• Store vehicle data in a file or database

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👤 Author

Name: Pirakala Sushwanth

Register Number: 24MIM10048

Course: Programming in Java

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