Add java 11 support for #987 (o-t) (#1051)

* Use java 11

* Use .of
- Replace Arrays.asList with List.of
- Replace HashSet<>(List.of()) with Set.of

* Formatting

specification/src/main/java/com/iluwatar/specification/app/App.java

@@ -23,17 +23,7 @@
 
 package com.iluwatar.specification.app;
 
-import java.util.Arrays;
-import java.util.List;
-import java.util.stream.Collectors;
-
-import com.iluwatar.specification.creature.Creature;
-import com.iluwatar.specification.creature.Dragon;
-import com.iluwatar.specification.creature.Goblin;
-import com.iluwatar.specification.creature.KillerBee;
-import com.iluwatar.specification.creature.Octopus;
-import com.iluwatar.specification.creature.Shark;
-import com.iluwatar.specification.creature.Troll;
+import com.iluwatar.specification.creature.*;
 import com.iluwatar.specification.property.Color;
 import com.iluwatar.specification.property.Movement;
 import com.iluwatar.specification.selector.ColorSelector;
@@ -41,6 +31,9 @@ import com.iluwatar.specification.selector.MovementSelector;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.List;
+import java.util.stream.Collectors;
+
 /**
  * 
  * The central idea of the Specification pattern is to separate the statement of how to match a
@@ -64,8 +57,7 @@ public class App {
   public static void main(String[] args) {
     // initialize creatures list
     List<Creature> creatures =
-        Arrays.asList(new Goblin(), new Octopus(), new Dragon(), new Shark(), new Troll(),
-            new KillerBee());
+          List.of(new Goblin(), new Octopus(), new Dragon(), new Shark(), new Troll(), new KillerBee());
     // find all walking creatures
     LOGGER.info("Find all walking creatures");
     List<Creature> walkingCreatures =