Code cleanup (#1461)

* Code cleanup

* Fix flux tests

* Fix checkstyle errors

* Fix compile error

reader-writer-lock/src/main/java/com/iluwatar/reader/writer/lock/Reader.java

@@ -34,11 +34,11 @@ public class Reader implements Runnable {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(Reader.class);
 
-  private Lock readLock;
+  private final Lock readLock;
 
-  private String name;
+  private final String name;
 
-  private long readingTime;
+  private final long readingTime;
 
   /**
    * Create new Reader.

reader-writer-lock/src/main/java/com/iluwatar/reader/writer/lock/ReaderWriterLock.java

@@ -59,8 +59,8 @@ public class ReaderWriterLock implements ReadWriteLock {
    */
   private final Set<Object> globalMutex = new HashSet<>();
 
-  private ReadLock readerLock = new ReadLock();
-  private WriteLock writerLock = new WriteLock();
+  private final ReadLock readerLock = new ReadLock();
+  private final WriteLock writerLock = new WriteLock();
 
   @Override
   public Lock readLock() {

reader-writer-lock/src/main/java/com/iluwatar/reader/writer/lock/Writer.java

@@ -34,11 +34,11 @@ public class Writer implements Runnable {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(Writer.class);
 
-  private Lock writeLock;
+  private final Lock writeLock;
 
-  private String name;
+  private final String name;
 
-  private long writingTime;
+  private final long writingTime;
 
   /**
    * Create new Writer who writes for 250ms.

reader-writer-lock/src/test/java/com/iluwatar/reader/writer/lock/utils/InMemoryAppender.java

@@ -34,7 +34,7 @@ import org.slf4j.LoggerFactory;
  * InMemory Log Appender Util.
  */
 public 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);