This paper explores the implementation and design philosophy of a Car class in Java, a fundamental exercise in Object-Oriented Programming (OOP). We will cover the core components: encapsulation of attributes, constructor logic, and behavioral methods. 1. Introduction to the Car Class
A "solid" Car class often serves as a parent class. Through , we can create specialized classes like ElectricCar or Truck that inherit the properties of Car but add specific features (e.g., batteryCapacity or towingLimit ). car-class-java
: String identifiers for the manufacturer and specific version. Year : An integer representing the production date. This paper explores the implementation and design philosophy
public class Car { // Attributes private String make; private String model; private int year; private double fuelLevel; private boolean isRunning; // Constructor public Car(String make, String model, int year) { this.make = make; this.model = model; this.year = year; this.fuelLevel = 100.0; // Starts with a full tank this.isRunning = false; } // Behavioral Methods public void startEngine() { if (fuelLevel > 0) { isRunning = true; System.out.println("The " + model + " engine roars to life."); } else { System.out.println("Out of fuel. Cannot start."); } } public void drive(double distance) { if (isRunning) { fuelLevel -= (distance * 0.05); // Simple fuel consumption logic System.out.println("Driving... Remaining fuel: " + fuelLevel + "%"); } else { System.out.println("Start the engine first!"); } } // Getters and Setters public String getModel() { return model; } public void setModel(String model) { this.model = model; } } Use code with caution. Copied to clipboard 4. Advanced Concepts: Inheritance and Polymorphism Introduction to the Car Class A "solid" Car
The state of a car is defined by its fields. To follow Java best practices, we use by marking these fields private and providing public getter and setter methods. This protects the data from unauthorized interference.
: A double representing the current gas or charge. IsRunning : A boolean flag to track the engine state. 3. Implementation Example Below is a standard implementation of a robust Car class.
allows us to treat a List containing both gas and electric vehicles uniformly, calling a .refuel() method that behaves differently depending on the specific object type. 5. Conclusion