Java 11 migrate remaining (g,h,i) (#1116)

* Moves game-loop to Java 11

* Moves guarded-suspension to Java 11

* Moves half-sync-half-async to Java 11

* Moves hexagonal to Java 11

* Moves intercepting-filter to Java 11

* Moves interpreter to Java 11

* Moves iterator to Java 11

half-sync-half-async/src/main/java/com/iluwatar/halfsynchalfasync/App.java

@@ -70,7 +70,7 @@ public class App {
    * @param args command line args
    */
   public static void main(String[] args) {
-    AsynchronousService service = new AsynchronousService(new LinkedBlockingQueue<>());
+    var service = new AsynchronousService(new LinkedBlockingQueue<>());
     /*
      * A new task to calculate sum is received but as this is main thread, it should not block. So
      * it passes it to the asynchronous task layer to compute and proceeds with handling other

half-sync-half-async/src/test/java/com/iluwatar/halfsynchalfasync/AppTest.java

@@ -25,12 +25,8 @@ package com.iluwatar.halfsynchalfasync;
 
 import org.junit.jupiter.api.Test;
 
-import java.util.concurrent.ExecutionException;
-
 /**
- * 
  * Application test
- *
  */
 public class AppTest {
 

half-sync-half-async/src/test/java/com/iluwatar/halfsynchalfasync/AsynchronousServiceTest.java

@@ -57,13 +57,13 @@ public class AsynchronousServiceTest {
 
   @Test
   public void testPerfectExecution() throws Exception {
-    final Object result = new Object();
+    final var result = new Object();
     when(task.call()).thenReturn(result);
     service.execute(task);
 
     verify(task, timeout(2000)).onPostCall(eq(result));
 
-    final InOrder inOrder = inOrder(task);
+    final var inOrder = inOrder(task);
     inOrder.verify(task, times(1)).onPreCall();
     inOrder.verify(task, times(1)).call();
     inOrder.verify(task, times(1)).onPostCall(eq(result));
@@ -73,13 +73,13 @@ public class AsynchronousServiceTest {
 
   @Test
   public void testCallException() throws Exception {
-    final IOException exception = new IOException();
+    final var exception = new IOException();
     when(task.call()).thenThrow(exception);
     service.execute(task);
 
     verify(task, timeout(2000)).onError(eq(exception));
 
-    final InOrder inOrder = inOrder(task);
+    final var inOrder = inOrder(task);
     inOrder.verify(task, times(1)).onPreCall();
     inOrder.verify(task, times(1)).call();
     inOrder.verify(task, times(1)).onError(exception);
@@ -89,13 +89,13 @@ public class AsynchronousServiceTest {
 
   @Test
   public void testPreCallException() {
-    final IllegalStateException exception = new IllegalStateException();
+    final var exception = new IllegalStateException();
     doThrow(exception).when(task).onPreCall();
     service.execute(task);
 
     verify(task, timeout(2000)).onError(eq(exception));
 
-    final InOrder inOrder = inOrder(task);
+    final var inOrder = inOrder(task);
     inOrder.verify(task, times(1)).onPreCall();
     inOrder.verify(task, times(1)).onError(exception);