Refactor: remove example package

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

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+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 {
+
+    private int seats;
+
+    public Car(String brand, String model, int year,
+               double mileage, int seats) {
+
+        // TODO: Call super constructor
+        this.seats = seats;
+    }
+
+    // TODO: Override getEnergyType() → return "Unknown"
+
+    // TODO: Override showDetails()
+
+    /*
+     * 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"
+     */
+}

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

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+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 {
+
+    private int batteryCapacity;
+    private double chargeLevel;
+
+    public ElectricCar(String brand, String model, int year,
+                       double mileage, int seats,
+                       int batteryCapacity, double chargeLevel) {
+
+        super(brand, model, year, mileage, seats);
+        this.batteryCapacity = batteryCapacity;
+        this.chargeLevel = chargeLevel;
+    }
+
+    // TODO: Override getEnergyType() → return "Electric"
+
+    // TODO: Override showDetails()
+
+    // TODO: Implement charge(double amount)
+    // Validate negative
+    // Cap at 100
+}

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

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+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 {
+
+    private double fuelLevel;
+    private String fuelType;
+
+    public GasCar(String brand, String model, int year,
+                  double mileage, int seats,
+                  double fuelLevel, String fuelType) {
+
+        super(brand, model, year, mileage, seats);
+        this.fuelLevel = fuelLevel;
+        this.fuelType = fuelType;
+    }
+
+    // TODO: Override getEnergyType() → return fuelType + " (Gas)"
+
+    // TODO: Implement refuel(double amount)
+    // Validate amount
+    // Cap at 100
+
+    // TODO: Override showDetails()
+}

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

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+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 {
+
+    private double zeroToHundred;
+
+    public SportsCar(String brand, String model, int year,
+                     double mileage, int seats,
+                     double fuelLevel, String fuelType,
+                     double zeroToHundred) {
+
+        super(brand, model, year, mileage, seats,
+                fuelLevel, fuelType);
+
+        this.zeroToHundred = zeroToHundred;
+    }
+
+    // TODO: Override showDetails()
+    // Print header
+    // Call super.showDetails()
+    // Print acceleration time
+}

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

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+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 {
+
+    private String brand;
+    private String model;
+    private int year;
+    private 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
+
+    // TODO: Implement addMileage(double km)
+    // If km is negative → print error
+    // Otherwise increase mileage
+
+    // TODO: Declare abstract method getEnergyType()
+
+    public void basicInfo() {
+        System.out.println(
+                year + " " + brand + " " + model +
+                        " | Mileage: " + mileage +
+                        " | Energy: " + getEnergyType()
+        );
+    }
+
+    public abstract void showDetails();
+}