complete all TODO sections in ElectricCar class

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

@@ -1,15 +1,5 @@
 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;
 
@@ -27,13 +17,44 @@ public class ElectricCar extends Car implements Chargeable {
         this.chargeLevel = chargeLevel;
     }
 
-    // TODO: Override getEnergyType() → return "Electric"
+    public int getBatteryCapacity() { return this.batteryCapacity; }
+    public void setBatteryCapacity(int batteryCapacity) { this.batteryCapacity = batteryCapacity; }
+    public double getChargeLevel() { return this.chargeLevel; }
+    public void setChargeLevel(double chargeLevel) { this.chargeLevel = chargeLevel; }
 
-    // TODO: Override showDetails()
-    // Call super.showDetails()
-    // Print battery capacity and charge level
 
-    // TODO: Implement charge(double amount)
-    // Validate negative
-    // Cap at 100
+    @Override
+    public String getEnergyType() {
+        return "Electric";
+    }
+
+    @Override
+    public void showDetails() {
+        super.showDetails();
+        System.out.println(
+                "battery capacity: " + getBatteryCapacity() + "\n"
+                        + " charge level: " + getChargeLevel());
+    }
+
+    @Override
+    public void charge(double amount) {
+        if (amount < 0) {
+            throw new IllegalArgumentException("Amount must be positive");
+        }
+        if ( getChargeLevel() + amount > 100 ) {
+            setChargeLevel(100);
+        }
+        setChargeLevel(getChargeLevel() + amount);
+    }
+    
+    @Override
+    public boolean needsService(Vehicle v) {
+        return getMileage() > 8000;
+    }
+
+    @Override
+    public void performService() {
+        System.out.println("Battery system checked");
+        setChargeLevel(100);
+    }
 }

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

@@ -41,8 +41,8 @@ public class GasCar extends Car implements Refuelable {
     public void showDetails() {
         super.showDetails();
         System.out.println(
-                "fuel level: " + this.fuelLevel + "\n"
-        + " fuel type: " + this.fuelType);
+                "fuel level: " + getFuelLevel() + "\n"
+        + " fuel type: " + getFuelType());
     }
 
     @Override