Code cleanup (#1461)

* Code cleanup

* Fix flux tests

* Fix checkstyle errors

* Fix compile error

specification/src/main/java/com/iluwatar/specification/creature/AbstractCreature.java

@@ -33,11 +33,11 @@ import com.iluwatar.specification.property.Size;
  */
 public abstract class AbstractCreature implements Creature {
 
-  private String name;
-  private Size size;
-  private Movement movement;
-  private Color color;
-  private Mass mass;
+  private final String name;
+  private final Size size;
+  private final Movement movement;
+  private final Color color;
+  private final Mass mass;
 
   /**
    * Constructor.

specification/src/main/java/com/iluwatar/specification/property/Color.java

@@ -30,7 +30,7 @@ public enum Color {
 
   DARK("dark"), LIGHT("light"), GREEN("green"), RED("red");
 
-  private String title;
+  private final String title;
 
   Color(String title) {
     this.title = title;

specification/src/main/java/com/iluwatar/specification/property/Mass.java

@@ -28,8 +28,8 @@ package com.iluwatar.specification.property;
  */
 public class Mass {
 
-  private double value;
-  private String title;
+  private final double value;
+  private final String title;
 
   public Mass(double value) {
     this.value = value;

specification/src/main/java/com/iluwatar/specification/property/Movement.java

@@ -30,7 +30,7 @@ public enum Movement {
 
   WALKING("walking"), SWIMMING("swimming"), FLYING("flying");
 
-  private String title;
+  private final String title;
 
   Movement(String title) {
     this.title = title;

specification/src/main/java/com/iluwatar/specification/property/Size.java

@@ -30,7 +30,7 @@ public enum Size {
 
   SMALL("small"), NORMAL("normal"), LARGE("large");
 
-  private String title;
+  private final String title;
 
   Size(String title) {
     this.title = title;

specification/src/main/java/com/iluwatar/specification/selector/ConjunctionSelector.java

@@ -30,7 +30,7 @@ import java.util.List;
  */
 public class ConjunctionSelector<T> extends AbstractSelector<T> {
 
-  private List<AbstractSelector<T>> leafComponents;
+  private final List<AbstractSelector<T>> leafComponents;
 
   @SafeVarargs
   ConjunctionSelector(AbstractSelector<T>... selectors) {

specification/src/main/java/com/iluwatar/specification/selector/DisjunctionSelector.java

@@ -30,7 +30,7 @@ import java.util.List;
  */
 public class DisjunctionSelector<T> extends AbstractSelector<T> {
 
-  private List<AbstractSelector<T>> leafComponents;
+  private final List<AbstractSelector<T>> leafComponents;
 
   @SafeVarargs
   DisjunctionSelector(AbstractSelector<T>... selectors) {

specification/src/main/java/com/iluwatar/specification/selector/NegationSelector.java

@@ -30,7 +30,7 @@ package com.iluwatar.specification.selector;
  */
 public class NegationSelector<T> extends AbstractSelector<T> {
 
-  private AbstractSelector<T> component;
+  private final AbstractSelector<T> component;
 
   NegationSelector(AbstractSelector<T> selector) {
     this.component = selector;