add java 11 support (o) (#1222)

observer/src/main/java/com/iluwatar/observer/App.java

@@ -51,7 +51,7 @@ public class App {
    */
   public static void main(String[] args) {
 
-    Weather weather = new Weather();
+    var weather = new Weather();
     weather.addObserver(new Orcs());
     weather.addObserver(new Hobbits());
 
@@ -62,7 +62,7 @@ public class App {
 
     // Generic observer inspired by Java Generics and Collection by Naftalin & Wadler
     LOGGER.info("--Running generic version--");
-    GWeather genericWeather = new GWeather();
+    var genericWeather = new GWeather();
     genericWeather.addObserver(new GOrcs());
     genericWeather.addObserver(new GHobbits());
 

observer/src/main/java/com/iluwatar/observer/Weather.java

@@ -56,14 +56,14 @@ public class Weather {
    * Makes time pass for weather.
    */
   public void timePasses() {
-    WeatherType[] enumValues = WeatherType.values();
+    var enumValues = WeatherType.values();
     currentWeather = enumValues[(currentWeather.ordinal() + 1) % enumValues.length];
     LOGGER.info("The weather changed to {}.", currentWeather);
     notifyObservers();
   }
 
   private void notifyObservers() {
-    for (WeatherObserver obs : observers) {
+    for (var obs : observers) {
       obs.update(currentWeather);
     }
   }

observer/src/main/java/com/iluwatar/observer/generic/GWeather.java

@@ -44,7 +44,7 @@ public class GWeather extends Observable<GWeather, Race, WeatherType> {
    * Makes time pass for weather.
    */
   public void timePasses() {
-    WeatherType[] enumValues = WeatherType.values();
+    var enumValues = WeatherType.values();
     currentWeather = enumValues[(currentWeather.ordinal() + 1) % enumValues.length];
     LOGGER.info("The weather changed to {}.", currentWeather);
     notifyObservers(currentWeather);

observer/src/main/java/com/iluwatar/observer/generic/Observable.java

@@ -54,7 +54,7 @@ public abstract class Observable<S extends Observable<S, O, A>, O extends Observ
    */
   @SuppressWarnings("unchecked")
   public void notifyObservers(A argument) {
-    for (O observer : observers) {
+    for (var observer : observers) {
       observer.update((S) this, argument);
     }
   }