Solution for Enums 01

Engine.java

@@ -0,0 +1,16 @@
+public enum Engine {
+  DIESEL("Diesel"),
+  PETROL("Benzin"),
+  GAS("Gas"),
+  ELECTRO("Elektro");
+
+  private final String description;
+
+  Engine(String description) {
+    this.description = description;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+}

Exercise.java

@@ -3,10 +3,13 @@ public class Exercise {
   public static void main(String[] args) {
     System.out.println("Anzahl Fahrzeuge: " + Vehicle.getNumberOfVehicles());
 
-    Vehicle vehicle = new Vehicle("Porsche", "911");
-    Vehicle vehicle1 = new Vehicle("Porsche", "911");
-    Vehicle vehicle2 = new Vehicle("MAN", "TGX");
-    Vehicle vehicle3 = new Vehicle("Opel", "Zafira Life");
+    Vehicle vehicle1 = new Vehicle("Porsche", "911", Engine.ELECTRO);
+    Vehicle vehicle2 = new Vehicle("MAN", "TGX", Engine.DIESEL);
+    Vehicle vehicle3 = new Vehicle("Opel", "Zafira Life", Engine.DIESEL);
+
+    System.out.println(vehicle1.toString());
+    System.out.println(vehicle2.toString());
+    System.out.println(vehicle3.toString());
 
     System.out.println("Anzahl Fahrzeuge: " + Vehicle.getNumberOfVehicles());
   }

Vehicle.java

@@ -1,14 +1,16 @@
 public class Vehicle {
 
-  private String make;
-  private String model;
+  private final String make;
+  private final String model;
   private double speedInKmh;
+  private final Engine engine;
   private static int numberOfVehicles;
 
-  public Vehicle(String make, String model) {
+  public Vehicle(String make, String model, Engine engine) {
     this.make = make;
     this.model = model;
     Vehicle.numberOfVehicles++;
+    this.engine = engine;
   }
 
   public String getMake() {
@@ -19,12 +21,12 @@ public String getModel() {
     return model;
   }
 
-  public double getSpeedInKmh() {
-    return speedInKmh;
+  public Engine getEngine() {
+    return engine;
   }
 
-  public static int getNumberOfVehicles() {
-    return Vehicle.numberOfVehicles;
+  public double getSpeedInKmh() {
+    return speedInKmh;
   }
 
   public void accelerate(int valueInKmh) {
@@ -38,6 +40,10 @@ public void brake(int valueInKmh) {
   }
 
   public String toString() {
-    return make + " " + model;
+    return getMake() + " " + getModel() + " (" + getEngine().getDescription() + ")";
+  }
+
+  public static int getNumberOfVehicles() {
+    return Vehicle.numberOfVehicles;
   }
 }