do tasks and learn OOP concepts like Interfaces, Inheritance, Polymorphism, and Abstraction.

src/main/java/org/Main.java

@@ -1,126 +1,81 @@
 package org;
 
+import org.behavior.Serviceable;
+import org.model.*;
+import org.util.VehicleInspector;
+
 public class Main {
     public static void main(String[] args) {
 
         // ============================================================
-        // TODO 1:
+        // TODO 1: Create vehicle instances
-        // 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(...);
         // ============================================================
+        ElectricCar tesla = new ElectricCar(
+                "Tesla", "Model S", 2022, 1000,
+                5, 100, 75
+        );
 
+        GasCar toyota = new GasCar(
+                "Toyota", "Corolla", 2018, 85000,
+                5, 50, "Petrol"
+        );
 
+        SportsCar ferrari = new SportsCar(
+                "Ferrari", "F8 Tributo", 2021, 12000,
+                2, 60, "Premium", 2.9
+        );
 
-
+        HybridCar prius = new HybridCar(
+                "Toyota", "Prius", 2023, 15000,
+                5, 40, 60
+        );
 
         // ============================================================
-        // TODO 2:
+        // TODO 2: Create array of Vehicle (polymorphism)
-        // 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).
         // ============================================================
-
+        Vehicle[] vehicles = { tesla, toyota, ferrari, prius };
-
-
-
 
         // ============================================================
-        // TODO 3:
+        // TODO 3: Loop through vehicles and print basic info
-        // 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.
         // ============================================================
-
+        System.out.println("=== Vehicle Basic Info ===");
-
+        for (Vehicle v : vehicles) {
-
+            v.basicInfo();
-
+            System.out.println();
+        }
 
         // ============================================================
-        // TODO 4:
+        // TODO 4: Inspect each vehicle using VehicleInspector
-        // Use VehicleInspector to inspect each vehicle:
-        //
-        //     VehicleInspector.inspect(v);
-        //
-        // Purpose:
-        //   • Demonstrate the use of `instanceof`
-        //   • Show subclass‑specific inspection messages
         // ============================================================
-
+        System.out.println("=== Vehicle Inspection ===");
-
+        for (Vehicle v : vehicles) {
-
+            VehicleInspector.inspect(v);
-
+            System.out.println();
+        }
 
         // ============================================================
-        // TODO 5:
+        // TODO 5: Create array of Serviceable
-        // 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;
-        //
         // ============================================================
-
+        Serviceable[] serviceables = { tesla, toyota, ferrari, prius };
-
-
-
 
         // ============================================================
-        // TODO 6:
+        // TODO 6: Loop through serviceables and perform service
-        // 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.
         // ============================================================
-
+        System.out.println("=== Service Check ===");
-
+        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 7 (Optional):
+        // TODO 7: Final message
-        // After everything is done, print a final message:
-        //
-        //   System.out.println("=== Workshop Completed ===");
-        //
         // ============================================================
-
+        System.out.println("=== Workshop Completed ===");
-
-
-
-
     }
 }

src/main/java/org/model/Car.java

@@ -18,24 +18,29 @@ public abstract class Car extends Vehicle implements Serviceable {
     public Car(String brand, String model, int year,
                double mileage, int seats) {
 
-        // TODO: Call super constructor
+        super(brand, model, year, mileage);
         this.seats = seats;
     }
 
-    // TODO: Override getEnergyType() → return "Unknown"
+    public int getSeats() { return seats; }
 
-    // TODO: Override showDetails()
+    @Override
-    // Print brand, model, year, mileage, and number of seats
+    public String getEnergyType() { return "Unknown"; }
 
-    /*
+    @Override
-     * Implement Serviceable methods:
+    public void showDetails() {
-     *
+        System.out.println("Brand: " + getBrand() + " | Model: " + getModel() +
-     * needsService(Vehicle v):
+                " | Year: " + getYear() + " | Mileage: " + getMileage() +
-     * - Check the mileage of the current car
+                " | Seats: " + seats);
-     * - If mileage > 10000 return true
+    }
-     * - Otherwise return false
+
-     *
+    @Override
-     * performService():
+    public boolean needsService(Vehicle v) {
-     * - Print: "General car service completed"
+        return v.getMileage() > 10000;
-     */
+    }
+
+    @Override
+    public void performService() {
+        System.out.println("General car service completed");
+    }
 }

src/main/java/org/model/ElectricCar.java

@@ -27,13 +27,32 @@ public class ElectricCar extends Car implements Chargeable {
         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 | 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("Error: charge amount cannot be negative.");
+            return;
+        }
+        chargeLevel = Math.min(100, chargeLevel + amount);
+    }
+
+    @Override
+    public boolean needsService(Vehicle v) {
+        return v.getMileage() > 8000;
+    }
+
+    @Override
+    public void performService() {
+        System.out.println("Battery system checked");
+        chargeLevel = 100;
+    }
 }

src/main/java/org/model/GasCar.java

@@ -27,13 +27,32 @@ public class GasCar extends Car implements Refuelable {
         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("Error: refuel amount cannot be negative.");
+            return;
+        }
+        fuelLevel = Math.min(100, fuelLevel + amount);
+    }
 
-    // TODO: Override showDetails()
+    @Override
-    // Call super.showDetails()
+    public void showDetails() {
-    // Print fuel level and fuel type
+        super.showDetails();
+        System.out.println("Fuel Level: " + fuelLevel + "% | Fuel Type: " + fuelType);
+    }
+
+    @Override
+    public boolean needsService(Vehicle v) {
+        return v.getMileage() > 12000;
+    }
+
+    @Override
+    public void performService() {
+        System.out.println("Engine oil changed");
+        fuelLevel = 100;
+    }
 }

src/main/java/org/model/HybridCar.java

@@ -0,0 +1,57 @@
+package org.model;
+
+import org.behavior.Chargeable;
+import org.behavior.Refuelable;
+
+public class HybridCar extends Car implements Refuelable, Chargeable {
+
+    private double fuelLevel;
+    private double chargeLevel;
+
+    public HybridCar(String brand, String model, int year,
+                     double mileage, int seats,
+                     double fuelLevel, double chargeLevel) {
+        super(brand, model, year, mileage, seats);
+        this.fuelLevel = fuelLevel;
+        this.chargeLevel = chargeLevel;
+    }
+
+    @Override
+    public String getEnergyType() { return "Hybrid"; }
+
+    @Override
+    public void refuel(double amount) {
+        if (amount < 0) {
+            System.out.println("Error: refuel amount cannot be negative.");
+            return;
+        }
+        fuelLevel = Math.min(100, fuelLevel + amount);
+    }
+
+    @Override
+    public void charge(double amount) {
+        if (amount < 0) {
+            System.out.println("Error: charge amount cannot be negative.");
+            return;
+        }
+        chargeLevel = Math.min(100, chargeLevel + amount);
+    }
+
+    @Override
+    public void showDetails() {
+        super.showDetails();
+        System.out.println("Fuel Level: " + fuelLevel + "% | Charge Level: " + chargeLevel + "%");
+    }
+
+    @Override
+    public boolean needsService(Vehicle v) {
+        return v.getMileage() > 10000;
+    }
+
+    @Override
+    public void performService() {
+        System.out.println("Engine oil changed and battery system checked");
+        fuelLevel = 100;
+        chargeLevel = 100;
+    }
+}

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

@@ -24,7 +24,19 @@ public class SportsCar extends GasCar {
         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 + "s");
+    }
+
+    @Override
+    public boolean needsService(Vehicle v) {
+        return v.getMileage() > 5000;
+    }
+
+    @Override
+    public void performService() {
+        System.out.println("High-performance brake system checked");
+    }
 }

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

@@ -20,13 +20,20 @@ public abstract class Vehicle {
         this.mileage = mileage;
     }
 
-    // TODO: Create getters for all fields
+    public String getBrand() { return brand; }
+    public String getModel() { return model; }
+    public int getYear() { return year; }
+    public double getMileage() { return mileage; }
 
-    // TODO: Implement addMileage(double km)
+    public void addMileage(double km) {
-    // If km is negative → print error
+        if (km < 0) {
-    // Otherwise increase mileage
+            System.out.println("Error: mileage cannot be negative.");
+        } else {
+            mileage += km;
+        }
+    }
 
-    // TODO: Declare abstract method getEnergyType()
+    public abstract String getEnergyType();
 
     public void basicInfo() {
         System.out.println(

src/main/java/org/util/VehicleInspector.java

@@ -1,6 +1,8 @@
 package org.util;
 
-import org.*;
+import org.model.ElectricCar;
+import org.model.GasCar;
+import org.model.SportsCar;
 import org.model.Vehicle;
 
 /*
@@ -14,9 +16,12 @@ public class VehicleInspector {
 
         v.basicInfo();
 
-        // TODO:
+        if (v instanceof ElectricCar) {
-        // If ElectricCar → print "Check battery system"
+            System.out.println("Check battery system");
-        // If SportsCar → print "Check brakes and performance"
+        } else if (v instanceof SportsCar) {
-        // If GasCar → print "Check engine and oil"
+            System.out.println("Check brakes and performance");
+        } else if (v instanceof GasCar) {
+            System.out.println("Check engine and oil");
+        }
     }
 }