Code cleanup (#1461)

* Code cleanup

* Fix flux tests

* Fix checkstyle errors

* Fix compile error

decorator/README.md

@@ -70,7 +70,7 @@ public class ClubbedTroll implements Troll {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(ClubbedTroll.class);
 
-  private Troll decorated;
+  private final Troll decorated;
 
   public ClubbedTroll(Troll decorated) {
     this.decorated = decorated;

decorator/src/main/java/com/iluwatar/decorator/ClubbedTroll.java

@@ -33,7 +33,7 @@ public class ClubbedTroll implements Troll {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(ClubbedTroll.class);
 
-  private Troll decorated;
+  private final Troll decorated;
 
   public ClubbedTroll(Troll decorated) {
     this.decorated = decorated;

decorator/src/test/java/com/iluwatar/decorator/SimpleTrollTest.java

@@ -68,7 +68,7 @@ public class SimpleTrollTest {
 
   private class InMemoryAppender extends AppenderBase<ILoggingEvent> {
 
-    private List<ILoggingEvent> log = new LinkedList<>();
+    private final List<ILoggingEvent> log = new LinkedList<>();
 
     public InMemoryAppender(Class clazz) {
       ((Logger) LoggerFactory.getLogger(clazz)).addAppender(this);