complete

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

@@ -1,16 +1,4 @@
 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 {
@@ -27,13 +15,35 @@ public class GasCar extends Car implements Refuelable {
         this.fuelType = fuelType;
     }
 
-    // TODO: Override getEnergyType() → return fuelType + " (Gas)"
+    @Override
+    public String getEnergyType() {
+        return fuelType + " (Gas)";
+    }
+    @Override
+    public void refuel(double amount) {
+        if (amount < 0) {
+            System.out.println("Fuel amount cannot be negative");
+            return;
+        }
+        fuelLevel += amount;
 
-    // TODO: Implement refuel(double amount)
-    // Validate amount
-    // Cap at 100
-
-    // TODO: Override showDetails()
-    // Call super.showDetails()
-    // Print fuel level and fuel type
-}
+        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 v.getMileage() > 12000;
+    }
+    @Override
+    public void performService() {
+        System.out.println("Engine oil changed");
+        fuelLevel = 100;
+    }
+}