From 1c7604b3c70975eaf55801a06825dbb02fbc7261 Mon Sep 17 00:00:00 2001 From: Romina Date: Tue, 28 Apr 2026 17:21:05 +0330 Subject: [PATCH] Vehicle Management System --- src/main/java/org/Main.java | 155 +++++-------------- src/main/java/org/model/Car.java | 60 +++---- src/main/java/org/model/ElectricCar.java | 69 ++++++--- src/main/java/org/model/GasCar.java | 68 +++++--- src/main/java/org/model/SportsCar.java | 38 +++-- src/main/java/org/model/Vehicle.java | 59 ++++--- src/main/java/org/util/VehicleInspector.java | 34 ++-- 7 files changed, 244 insertions(+), 239 deletions(-) diff --git a/src/main/java/org/Main.java b/src/main/java/org/Main.java index 7a3d8c8..7551bc6 100644 --- a/src/main/java/org/Main.java +++ b/src/main/java/org/Main.java @@ -1,126 +1,53 @@ package org; -public class Main { - public static void main(String[] args) { +import org.model.Porsche; +import org.model.Benz; +import org.model.Audi; +import org.model.Vehicle; +import org.service.Serviceable; +import org.util.VehicleInspector; - // ============================================================ - // TODO 1: - // Create one instance of each vehicle type: - // - ElectricCar - // - GasCar - // - SportsCar - // - // Requirements: - // • Use the constructors you created in each class. - // • Provide realistic values (brand, model, year, mileage, etc.). - // • Store them in variables such as: - // ElectricCar tesla = new ElectricCar(...); - // ============================================================ +public class Main +{ + public static void main(String[] args) + { + Porsche porsche = new Porsche("Porsche", "911 Carrera", 2023, 5000, 450); + Benz benz = new Benz("Mercedes-Benz", "E-Class", 2022, 10000, 220); + Audi audi = new Audi("Audi", "RS5 Sportback", 2021, 8000, 333); + Vehicle[] vehicles = {porsche, benz, audi}; + for (Vehicle v : vehicles) + { + v.basicInfo(); + System.out.println(); + } + for (Vehicle v : vehicles) + { + VehicleInspector.inspect(v); + System.out.println(); + } + Serviceable[] serviceables = {porsche, benz, audi}; - // ============================================================ - // TODO 2: - // Create an array of Vehicle: - // Vehicle[] vehicles = { ... }; - // - // This array MUST contain the objects created above. - // This demonstrates **polymorphism** because all different - // subclasses (ElectricCar, GasCar, SportsCar) are stored - // as their parent type (Vehicle). - // ============================================================ + for (Serviceable s : serviceables) + { + Vehicle v = (Vehicle) s; + if (s.needsService(v)) + { + System.out.println(v.getBrand() + " " + v.getModel() + " needs service."); + s.performService(); + } + else + { + System.out.println(v.getBrand() + " " + v.getModel() + " does not need service."); + } + System.out.println(); + } - - - - // ============================================================ - // TODO 3: - // Loop through the Vehicle[] array and: - // • Call v.basicInfo(); - // • Print a blank line after each. - // - // Purpose: - // Demonstrate that all subclasses share the same Vehicle - // behavior and can call inherited methods. - // ============================================================ - - - - - - // ============================================================ - // TODO 4: - // Use VehicleInspector to inspect each vehicle: - // - // VehicleInspector.inspect(v); - // - // Purpose: - // • Demonstrate the use of `instanceof` - // • Show subclass‑specific inspection messages - // ============================================================ - - - - - - // ============================================================ - // TODO 5: - // Create an array of Serviceable: - // Serviceable[] serviceables = { ... }; - // - // This demonstrates **interface‑based polymorphism**. - // Every Car subtype implements Serviceable. - // - // IMPORTANT: - // • You must cast to Vehicle when needed: - // Vehicle v = (Vehicle) s; - // - // ============================================================ - - - - - - // ============================================================ - // TODO 6: - // Loop through the Serviceable[] array: - // - // Steps inside loop: - // - // 1. Cast the current object to Vehicle: - // Vehicle v = (Vehicle) s; - // - // 2. Check: - // if (s.needsService(v)) { ... } - // - // 3. If true: - // - Print a message showing brand + model - // - Call s.performService(); - // - // 4. Otherwise: - // - Print that the car does not need service - // - // Add blank lines between each item for readability. - // ============================================================ - - - - - - // ============================================================ // TODO 7 (Optional): - // After everything is done, print a final message: - // - // System.out.println("=== Workshop Completed ==="); - // - // ============================================================ - - - - - + System.out.println("=== Workshop Completed ==="); } -} +} \ No newline at end of file diff --git a/src/main/java/org/model/Car.java b/src/main/java/org/model/Car.java index 74836b5..873d7ac 100644 --- a/src/main/java/org/model/Car.java +++ b/src/main/java/org/model/Car.java @@ -1,41 +1,43 @@ package org.model; -/* - * Car extends Vehicle. - * This class SHOULD implement Serviceable. - * - * Service logic for Car: - * - needsService(): return true if mileage > 10,000 - * - performService(): print "General car service completed" - */ - import org.behavior.Serviceable; -public abstract class Car extends Vehicle implements Serviceable { - +public abstract class Car extends Vehicle implements Serviceable +{ private int seats; public Car(String brand, String model, int year, - double mileage, int seats) { - - // TODO: Call super constructor + double mileage, int seats) + { + super(brand, model, year, mileage); this.seats = seats; } - // TODO: Override getEnergyType() → return "Unknown" + @Override + public String getEnergyType() + { + return "Unknown"; + } - // TODO: Override showDetails() - // Print brand, model, year, mileage, and number of seats + @Override + public void showDetails() + { + System.out.println("Brand: " + getBrand()); + System.out.println("Model: " + getModel()); + System.out.println("Year: " + getYear()); + System.out.println("Mileage: " + getMileage()); + System.out.println("Seats: " + seats); + } - /* - * Implement Serviceable methods: - * - * needsService(Vehicle v): - * - Check the mileage of the current car - * - If mileage > 10000 return true - * - Otherwise return false - * - * performService(): - * - Print: "General car service completed" - */ -} + @Override + public boolean needsService(Vehicle v) + { + return getMileage() > 10000; + } + + @Override + public void performService() + { + System.out.println("General car service completed"); + } +} \ No newline at end of file diff --git a/src/main/java/org/model/ElectricCar.java b/src/main/java/org/model/ElectricCar.java index 2ee9bd8..7e6a912 100644 --- a/src/main/java/org/model/ElectricCar.java +++ b/src/main/java/org/model/ElectricCar.java @@ -1,39 +1,62 @@ package org.model; -/* - * ElectricCar extends Car. - * It already inherits Serviceable from Car. - * - * Service logic for ElectricCar: - * - needsService(): return true if mileage > 8000 - * - performService(): - * Print "Battery system checked" - * Reset chargeLevel to 100 - */ - import org.behavior.Chargeable; -public class ElectricCar extends Car implements Chargeable { - +public class ElectricCar extends Car implements Chargeable +{ private int batteryCapacity; private double chargeLevel; public ElectricCar(String brand, String model, int year, double mileage, int seats, - int batteryCapacity, double chargeLevel) { - + int batteryCapacity, double chargeLevel) + { super(brand, model, year, mileage, seats); this.batteryCapacity = batteryCapacity; this.chargeLevel = chargeLevel; } - // TODO: Override getEnergyType() → return "Electric" + @Override + public String getEnergyType() + { + return "Electric"; + } - // TODO: Override showDetails() - // Call super.showDetails() - // Print battery capacity and charge level + @Override + public void showDetails() + { + super.showDetails(); + System.out.println("Battery Capacity: " + batteryCapacity + " kWh"); + System.out.println("Charge Level: " + chargeLevel + "%"); + } - // TODO: Implement charge(double amount) - // Validate negative - // Cap at 100 -} + @Override + public void charge(double amount) + { + if (amount < 0) + { + System.out.println("Charge amount cannot be negative."); + return; + } + + chargeLevel += amount; + if (chargeLevel > 100) + { + chargeLevel = 100; + } + } + + + @Override + public boolean needsService(Vehicle v) + { + return getMileage() > 8000; + } + + @Override + public void performService() + { + System.out.println("Battery system checked"); + chargeLevel = 100; + } +} \ No newline at end of file diff --git a/src/main/java/org/model/GasCar.java b/src/main/java/org/model/GasCar.java index 2109f93..cb50906 100644 --- a/src/main/java/org/model/GasCar.java +++ b/src/main/java/org/model/GasCar.java @@ -1,39 +1,61 @@ package org.model; -/* - * GasCar extends Car. - * Inherits Serviceable from Car. - * - * Service logic for GasCar: - * - needsService(): return true if mileage > 12000 - * - performService(): - * Print "Engine oil changed" - * Reset fuelLevel to 100 - */ - import org.behavior.Refuelable; -public class GasCar extends Car implements Refuelable { - +public class GasCar extends Car implements Refuelable +{ private double fuelLevel; private String fuelType; public GasCar(String brand, String model, int year, double mileage, int seats, - double fuelLevel, String fuelType) { - + double fuelLevel, String fuelType) + { super(brand, model, year, mileage, seats); this.fuelLevel = fuelLevel; this.fuelType = fuelType; } - // TODO: Override getEnergyType() → return fuelType + " (Gas)" + @Override + public String getEnergyType() + { + return fuelType + " (Gas)"; + } - // TODO: Implement refuel(double amount) - // Validate amount - // Cap at 100 + @Override + public void refuel(double amount) + { + if (amount < 0) + { + System.out.println("Refuel amount cannot be negative."); + return; + } - // TODO: Override showDetails() - // Call super.showDetails() - // Print fuel level and fuel type -} + fuelLevel += amount; + if (fuelLevel > 100) + { + fuelLevel = 100; + } + } + + @Override + public void showDetails() + { + super.showDetails(); + System.out.println("Fuel Level: " + fuelLevel + "%"); + System.out.println("Fuel Type: " + fuelType); + } + + @Override + public boolean needsService(Vehicle v) + { + return getMileage() > 12000; + } + + @Override + public void performService() + { + System.out.println("Engine oil changed"); + fuelLevel = 100; + } +} \ No newline at end of file diff --git a/src/main/java/org/model/SportsCar.java b/src/main/java/org/model/SportsCar.java index 25f5df9..93d0dff 100644 --- a/src/main/java/org/model/SportsCar.java +++ b/src/main/java/org/model/SportsCar.java @@ -1,30 +1,36 @@ package org.model; -/* - * SportsCar extends GasCar. - * - * Special service logic for SportsCar: - * - needsService(): return true if mileage > 5000 - * - performService(): - * Print "High-performance brake system checked" - */ - -public class SportsCar extends GasCar { - +public class SportsCar extends GasCar +{ private double zeroToHundred; public SportsCar(String brand, String model, int year, double mileage, int seats, double fuelLevel, String fuelType, - double zeroToHundred) { - + double zeroToHundred) + { super(brand, model, year, mileage, seats, fuelLevel, fuelType); this.zeroToHundred = zeroToHundred; } - // TODO: Override showDetails() - // Call super.showDetails() - // Print acceleration time + @Override + public void showDetails() + { + super.showDetails(); + System.out.println("0-100 km/h: " + zeroToHundred + " seconds"); + } + + @Override + public boolean needsService(Vehicle v) + { + return getMileage() > 5000; + } + + @Override + public void performService() + { + System.out.println("High-performance brake system checked"); + } } diff --git a/src/main/java/org/model/Vehicle.java b/src/main/java/org/model/Vehicle.java index 70615a9..fe7be50 100644 --- a/src/main/java/org/model/Vehicle.java +++ b/src/main/java/org/model/Vehicle.java @@ -1,40 +1,59 @@ package org.model; -/* - * Abstract base class for all vehicles. - * This class DOES NOT implement Serviceable. - * Service behavior will be defined in concrete subclasses. - */ - -public abstract class Vehicle { - +public abstract class Vehicle +{ private String brand; private String model; private int year; private double mileage; - public Vehicle(String brand, String model, int year, double mileage) { + public Vehicle(String brand, String model, int year, double mileage) + { this.brand = brand; this.model = model; this.year = year; this.mileage = mileage; } - // TODO: Create getters for all fields + public String getBrand() + { + return brand; + } - // TODO: Implement addMileage(double km) - // If km is negative → print error - // Otherwise increase mileage + public String getModel() + { + return model; + } - // TODO: Declare abstract method getEnergyType() + public int getYear() + { + return year; + } - public void basicInfo() { + public double getMileage() + { + return mileage; + } + + public void addMileage(double km) + { + if (km < 0) + { + System.out.println("Error: Mileage cannot be negative."); + } + else + { + this.mileage += km; + } + } + + public abstract String getEnergyType(); + + public void basicInfo() + { System.out.println( - year + " " + brand + " " + model + - " | Mileage: " + mileage + - " | Energy: " + getEnergyType() - ); + year + " " + brand + " " + model + " | Mileage: " + mileage + " | Energy: " + getEnergyType()); } public abstract void showDetails(); -} +} \ No newline at end of file diff --git a/src/main/java/org/util/VehicleInspector.java b/src/main/java/org/util/VehicleInspector.java index c83c420..d82f787 100644 --- a/src/main/java/org/util/VehicleInspector.java +++ b/src/main/java/org/util/VehicleInspector.java @@ -1,22 +1,28 @@ package org.util; -import org.*; +import org.model.ElectricCar; +import org.model.GasCar; +import org.model.SportsCar; import org.model.Vehicle; -/* - * Utility class to inspect vehicles. - * Demonstrates instanceof and polymorphism. - */ - -public class VehicleInspector { - - public static void inspect(Vehicle v) { +public class VehicleInspector +{ + public static void inspect(Vehicle v) + { v.basicInfo(); - // TODO: - // If ElectricCar → print "Check battery system" - // If SportsCar → print "Check brakes and performance" - // If GasCar → print "Check engine and oil" + if (v instanceof ElectricCar) + { + System.out.println("Check battery system"); + } + else if (v instanceof SportsCar) + { + System.out.println("Check brakes and performance"); + } + else if (v instanceof GasCar) + { + System.out.println("Check engine and oil"); + } } -} +} \ No newline at end of file