src/main/java/org/Main.java

@@ -1,126 +1,52 @@
 package org;
 
+import org.model.ElectricCar;
+import org.model.GasCar;
+import org.model.SportsCar;
+import org.model.Vehicle;
+import org.behavior.Serviceable;
+import org.util.VehicleInspector;
+
 public class Main {
-    public static void main(String[] args) {
+    public static void main(String[] args)
+    {
+        ElectricCar porsche = new ElectricCar("Porsche", "Taycan", 2023, 12000.0, 4, 93, 65.5);
 
-        // ============================================================
+        GasCar benz = new GasCar("Mercedes-Benz", "C200", 2022, 28000.0, 5, 42.0, "Petrol");
-        // 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(...);
-        // ============================================================
 
+        SportsCar audi = new SportsCar("Audi", "R8", 2021, 15000.0, 2, 55.0, "Petrol", 3.1);
 
+        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).
-        // ============================================================
-
-
-
-
-
-        // ============================================================
-        // 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 ===");
-        //
-        // ============================================================
-
-
-
 
+        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();
+        }
+        System.out.println("=== Workshop Completed ===");
     }
 }

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) {
+               double mileage, int seats)
-
+    {
-        // TODO: Call super constructor
+        super(brand, model, year, mileage);
         this.seats = seats;
     }
 
-    // TODO: Override getEnergyType() → return "Unknown"
+    @Override
+    public String getEnergyType()
+    {
+        return "Unknown";
+    }
 
-    // TODO: Override showDetails()
+    @Override
-    // Print brand, model, year, mileage, and number of seats
+    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);
+    }
 
-    /*
+    @Override
-     * Implement Serviceable methods:
+    public boolean needsService(Vehicle v)
-     *
+    {
-     * needsService(Vehicle v):
+        return getMileage() > 10000;
-     * - Check the mileage of the current car
+    }
-     * - If mileage > 10000 return true
+
-     * - Otherwise return false
+    @Override
-     *
+    public void performService()
-     * performService():
+    {
-     * - Print: "General car service completed"
+        System.out.println("General car service completed");
-     */
+    }
 }

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()
+    @Override
-    // Call super.showDetails()
+    public void showDetails()
-    // Print battery capacity and charge level
+    {
+        super.showDetails();
+        System.out.println("Battery Capacity: " + batteryCapacity + " kWh");
+        System.out.println("Charge Level: " + chargeLevel + "%");
+    }
 
-    // TODO: Implement charge(double amount)
+    @Override
-    // Validate negative
+    public void charge(double amount)
-    // Cap at 100
+    {
+        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;
+    }
 }

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)
+    @Override
-    // Validate amount
+    public void refuel(double amount)
-    // Cap at 100
+    {
+        if (amount < 0)
+        {
+            System.out.println("Refuel amount cannot be negative.");
+            return;
+        }
 
-    // TODO: Override showDetails()
+        fuelLevel += amount;
-    // Call super.showDetails()
+        if (fuelLevel > 100)
-    // Print fuel level and fuel type
+        {
+            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;
+    }
 }

src/main/java/org/model/SportsCar.java

@@ -1,30 +1,36 @@
 package org.model;
 
-/*
+public class SportsCar extends GasCar
- * 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 {
-
     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()
+    @Override
-    // Call super.showDetails()
+    public void showDetails()
-    // Print acceleration time
+    {
+        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");
+    }
 }

src/main/java/org/model/Vehicle.java

@@ -1,39 +1,58 @@
 package org.model;
 
-/*
+public abstract class Vehicle
- * Abstract base class for all vehicles.
+{
- * This class DOES NOT implement Serviceable.
- * Service behavior will be defined in concrete subclasses.
- */
-
-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)
+    public String getModel()
-    // If km is negative → print error
+    {
-    // Otherwise increase mileage
+        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 +
+                year + " " + brand + " " + model + " | Mileage: " + mileage + " | Energy: " + getEnergyType());
-                        " | Mileage: " + mileage +
-                        " | Energy: " + getEnergyType()
-        );
     }
 
     public abstract void showDetails();

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;
 
-/*
+public class VehicleInspector
- * Utility class to inspect vehicles.
+{
- * Demonstrates instanceof and polymorphism.
- */
-
-public class VehicleInspector {
-
-    public static void inspect(Vehicle v) {
 
+    public static void inspect(Vehicle v)
+    {
         v.basicInfo();
 
-        // TODO:
+        if (v instanceof ElectricCar)
-        // If ElectricCar → print "Check battery system"
+        {
-        // If SportsCar → print "Check brakes and performance"
+            System.out.println("Check battery system");
-        // If GasCar → print "Check engine and oil"
+        }
+        else if (v instanceof SportsCar)
+        {
+            System.out.println("Check brakes and performance");
+        }
+        else if (v instanceof GasCar)
+        {
+            System.out.println("Check engine and oil");
+        }
     }
 }