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

@@ -28,12 +28,35 @@ public class GasCar extends Car implements Refuelable {
     }
 
     // TODO: Override getEnergyType() → return fuelType + " (Gas)"
+    @Override
+    public String getEnergyType() {
+        return fuelType + " (Gas)";
+    }
+
 
     // TODO: Implement refuel(double amount)
-    // Validate amount
+    @Override
-    // Cap at 100
+    public void refuel(double amount) {
+        fuelLevel = 100;
+    }
+
 
     // TODO: Override showDetails()
-    // Call super.showDetails()
+    @Override
-    // Print fuel level and fuel type
+    public void showDetails() {
+        super.showDetails();
+        System.out.printf(", Fuel Type: %s, Fuel Level: %s\n",
+                fuelType, fuelLevel);
+    }
+
+    @Override
+    public boolean needsService(Vehicle v) {
+        return v.getMileage() > 12000;
+    }
+
+    @Override
+    public void performService() {
+        System.out.println("Engine oil changed");
+        fuelLevel = 100;
+    }
 }