Java 11 support for #984 #987 (l) (#1190)

* Java 11 support: lazy-loading pattern

* Java 11 support: layers pattern

* Java 11 support: leader-election/lazy-loading patterns

lazy-loading/src/test/java/com/iluwatar/lazy/loading/HolderNaiveTest.java

@@ -36,7 +36,7 @@ public class HolderNaiveTest extends AbstractHolderTest {
 
   @Override
   Heavy getInternalHeavyValue() throws Exception {
-    final Field holderField = HolderNaive.class.getDeclaredField("heavy");
+    final var holderField = HolderNaive.class.getDeclaredField("heavy");
     holderField.setAccessible(true);
     return (Heavy) holderField.get(this.holder);
   }

lazy-loading/src/test/java/com/iluwatar/lazy/loading/HolderThreadSafeTest.java

@@ -36,7 +36,7 @@ public class HolderThreadSafeTest extends AbstractHolderTest {
 
   @Override
   Heavy getInternalHeavyValue() throws Exception {
-    final Field holderField = HolderThreadSafe.class.getDeclaredField("heavy");
+    final var holderField = HolderThreadSafe.class.getDeclaredField("heavy");
     holderField.setAccessible(true);
     return (Heavy) holderField.get(this.holder);
   }

lazy-loading/src/test/java/com/iluwatar/lazy/loading/Java8HolderTest.java

@@ -38,16 +38,16 @@ public class Java8HolderTest extends AbstractHolderTest {
 
   @Override
   Heavy getInternalHeavyValue() throws Exception {
-    final Field holderField = Java8Holder.class.getDeclaredField("heavy");
+    final var holderField = Java8Holder.class.getDeclaredField("heavy");
     holderField.setAccessible(true);
 
-    final Supplier<Heavy> supplier = (Supplier<Heavy>) holderField.get(this.holder);
-    final Class<? extends Supplier> supplierClass = supplier.getClass();
+    final var supplier = (Supplier<Heavy>) holderField.get(this.holder);
+    final var supplierClass = supplier.getClass();
 
     // This is a little fishy, but I don't know another way to test this:
     // The lazy holder is at first a lambda, but gets replaced with a new supplier after loading ...
     if (supplierClass.isLocalClass()) {
-      final Field instanceField = supplierClass.getDeclaredField("heavyInstance");
+      final var instanceField = supplierClass.getDeclaredField("heavyInstance");
       instanceField.setAccessible(true);
       return (Heavy) instanceField.get(supplier);
     } else {