Implement facade for carsystem

patterns/facade/src/main/java/com/baeldung/pattern/facade/CarEngineFacade.java

@@ -0,0 +1,32 @@
+package com.baeldung.pattern.facade;
+
+import com.baeldung.pattern.facade.carsystem.*;
+
+public class CarEngineFacade {
+    private static final Integer DEFAULT_COOLING_TEMP = 90;
+    private static final Integer MAX_ALLOWED_TEMP = 50;
+    private FuelInjector fuelInjector = new FuelInjector();
+    private AirFlowController airFlowController = new AirFlowController();
+    private Starter starter = new Starter();
+    private CoolingController coolingController = new CoolingController();
+    private CatalyticConverter catalyticConverter = new CatalyticConverter();
+
+    public void startEngine(){
+        fuelInjector.on();
+        airFlowController.takeAir();
+        fuelInjector.on();
+        fuelInjector.inject();
+        starter.start();
+        coolingController.setTemperatureUpperLimit(DEFAULT_COOLING_TEMP);
+        coolingController.run();
+        catalyticConverter.on();
+    }
+
+    public void stopEngine(){
+        fuelInjector.off();
+        catalyticConverter.off();
+        coolingController.cool(MAX_ALLOWED_TEMP);
+        coolingController.stop();
+        airFlowController.off();
+    }
+}