decrease number of checkstyle errors in singleton, strategy and visitor patterns #1021 (#1054)

* fix checkstlye errors - visitor pattern

* fix checkstlye errors - strategy pattern

* fix checkstlye errors - singleton pattern

singleton/src/main/java/com/iluwatar/singleton/App.java

@@ -27,40 +27,40 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * Singleton pattern ensures that the class can have only one existing instance per Java classloader
+ * <p>Singleton pattern ensures that the class can have only one existing instance per Java
- * instance and provides global access to it.
+ * classloader instance and provides global access to it.</p>
- * <p>
+ *
- * One of the risks of this pattern is that bugs resulting from setting a singleton up in a
+ * <p>One of the risks of this pattern is that bugs resulting from setting a singleton up in a
  * distributed environment can be tricky to debug, since it will work fine if you debug with a
  * single classloader. Additionally, these problems can crop up a while after the implementation of
  * a singleton, since they may start out synchronous and only become async with time, so you it may
- * not be clear why you are seeing certain changes in behaviour.
+ * not be clear why you are seeing certain changes in behaviour.</p>
- * <p>
+ *
- * There are many ways to implement the Singleton. The first one is the eagerly initialized instance
+ * <p>There are many ways to implement the Singleton. The first one is the eagerly initialized
- * in {@link IvoryTower}. Eager initialization implies that the implementation is thread safe. If
+ * instance in {@link IvoryTower}. Eager initialization implies that the implementation is thread
- * you can afford giving up control of the instantiation moment, then this implementation will suit
+ * safe. If you can afford giving up control of the instantiation moment, then this implementation
- * you fine.
+ * will suit you fine.</p>
- * <p>
+ *
- * The other option to implement eagerly initialized Singleton is enum based Singleton. The example
+ * <p>The other option to implement eagerly initialized Singleton is enum based Singleton. The
- * is found in {@link EnumIvoryTower}. At first glance the code looks short and simple. However, you
+ * example is found in {@link EnumIvoryTower}. At first glance the code looks short and simple.
- * should be aware of the downsides including committing to implementation strategy, extending the
+ * However, you should be aware of the downsides including committing to implementation strategy,
- * enum class, serializability and restrictions to coding. These are extensively discussed in Stack
+ * extending the enum class, serializability and restrictions to coding. These are extensively
- * Overflow:
+ * discussed in Stack Overflow:
  * http://programmers.stackexchange.com/questions/179386/what-are-the-downsides-of-implementing
- * -a-singleton-with-javas-enum
+ * -a-singleton-with-javas-enum</p>
- * <p>
+ *
- * {@link ThreadSafeLazyLoadedIvoryTower} is a Singleton implementation that is initialized on
+ * <p>{@link ThreadSafeLazyLoadedIvoryTower} is a Singleton implementation that is initialized on
  * demand. The downside is that it is very slow to access since the whole access method is
- * synchronized.
+ * synchronized.</p>
- * <p>
+ *
- * Another Singleton implementation that is initialized on demand is found in
+ * <p>Another Singleton implementation that is initialized on demand is found in
  * {@link ThreadSafeDoubleCheckLocking}. It is somewhat faster than
  * {@link ThreadSafeLazyLoadedIvoryTower} since it doesn't synchronize the whole access method but
- * only the method internals on specific conditions.
+ * only the method internals on specific conditions.</p>
- * <p>
+ *
- * Yet another way to implement thread safe lazily initialized Singleton can be found in
+ * <p>Yet another way to implement thread safe lazily initialized Singleton can be found in
  * {@link InitializingOnDemandHolderIdiom}. However, this implementation requires at least Java 8
- * API level to work.
+ * API level to work.</p>
  */
 public class App {
 

singleton/src/main/java/com/iluwatar/singleton/EnumIvoryTower.java

@@ -24,10 +24,10 @@
 package com.iluwatar.singleton;
 
 /**
- * Enum based singleton implementation. Effective Java 2nd Edition (Joshua Bloch) p. 18
+ * <p>Enum based singleton implementation. Effective Java 2nd Edition (Joshua Bloch) p. 18</p>
  *
- * This implementation is thread safe, however adding any other method and its thread safety
+ * <p>This implementation is thread safe, however adding any other method and its thread safety
- * is developers responsibility.
+ * is developers responsibility.</p>
  */
 public enum EnumIvoryTower {
 

singleton/src/main/java/com/iluwatar/singleton/InitializingOnDemandHolderIdiom.java

@@ -24,16 +24,16 @@
 package com.iluwatar.singleton;
 
 /**
- * The Initialize-on-demand-holder idiom is a secure way of creating a lazy initialized singleton
+ * <p>The Initialize-on-demand-holder idiom is a secure way of creating a lazy initialized singleton
- * object in Java.
+ * object in Java.</p>
- * <p>
+ *
- * The technique is as lazy as possible and works in all known versions of Java. It takes advantage
+ * <p>The technique is as lazy as possible and works in all known versions of Java. It takes
- * of language guarantees about class initialization, and will therefore work correctly in all
+ * advantage of language guarantees about class initialization, and will therefore work correctly
- * Java-compliant compilers and virtual machines.
+ * in all Java-compliant compilers and virtual machines.</p>
- * <p>
+ *
- * The inner class is referenced no earlier (and therefore loaded no earlier by the class loader) than
+ * <p>The inner class is referenced no earlier (and therefore loaded no earlier by the class loader)
- * the moment that getInstance() is called. Thus, this solution is thread-safe without requiring special
+ * than the moment that getInstance() is called. Thus, this solution is thread-safe without
- * language constructs (i.e. volatile or synchronized).
+ * requiring special language constructs (i.e. volatile or synchronized).</p>
  *
  */
 public final class InitializingOnDemandHolderIdiom {
@@ -44,6 +44,8 @@ public final class InitializingOnDemandHolderIdiom {
   private InitializingOnDemandHolderIdiom() {}
 
   /**
+   * Sigleton instance.
+   *
    * @return Singleton instance
    */
   public static InitializingOnDemandHolderIdiom getInstance() {

singleton/src/main/java/com/iluwatar/singleton/ThreadSafeDoubleCheckLocking.java

@@ -24,11 +24,11 @@
 package com.iluwatar.singleton;
 
 /**
- * Double check locking
+ * <p>Double check locking.</p>
- * <p>
+ *
- * http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
+ * <p>http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html</p>
- * <p>
+ *
- * Broken under Java 1.4.
+ * <p>Broken under Java 1.4.</p>
  *
  * @author mortezaadi@gmail.com
  */
@@ -60,17 +60,21 @@ public final class ThreadSafeDoubleCheckLocking {
     // Joshua Bloch "Effective Java, Second Edition", p. 283-284
     
     var result = instance;
-    // Check if singleton instance is initialized. If it is initialized then we can return the instance.
+    // Check if singleton instance is initialized.
+    // If it is initialized then we can return the instance.
     if (result == null) {
-      // It is not initialized but we cannot be sure because some other thread might have initialized it
+      // It is not initialized but we cannot be sure because some other thread might have
-      // in the meanwhile. So to make sure we need to lock on an object to get mutual exclusion.
+      // initialized it in the meanwhile.
+      // So to make sure we need to lock on an object to get mutual exclusion.
       synchronized (ThreadSafeDoubleCheckLocking.class) {
-        // Again assign the instance to local variable to check if it was initialized by some other thread
+        // Again assign the instance to local variable to check if it was initialized by some
-        // while current thread was blocked to enter the locked zone. If it was initialized then we can 
+        // other thread while current thread was blocked to enter the locked zone.
-        // return the previously created instance just like the previous null check.
+        // If it was initialized then we can return the previously created instance
+        // just like the previous null check.
         result = instance;
         if (result == null) {
-          // The instance is still not initialized so we can safely (no other thread can enter this zone)
+          // The instance is still not initialized so we can safely
+          // (no other thread can enter this zone)
           // create an instance and make it our singleton instance.
           instance = result = new ThreadSafeDoubleCheckLocking();
         }

singleton/src/main/java/com/iluwatar/singleton/ThreadSafeLazyLoadedIvoryTower.java

@@ -24,11 +24,11 @@
 package com.iluwatar.singleton;
 
 /**
- * Thread-safe Singleton class. The instance is lazily initialized and thus needs synchronization
+ * <p>Thread-safe Singleton class. The instance is lazily initialized and thus needs synchronization
- * mechanism.
+ * mechanism.</p>
  *
- * Note: if created by reflection then a singleton will not be created but multiple options in the
+ * <p>Note: if created by reflection then a singleton will not be created but multiple options
- * same classloader
+ * in the same classloader</p>
  */
 public final class ThreadSafeLazyLoadedIvoryTower {
 

singleton/src/test/java/com/iluwatar/singleton/AppTest.java

@@ -26,9 +26,7 @@ package com.iluwatar.singleton;
 import org.junit.jupiter.api.Test;
 
 /**
- * 
+ * Application test.
- * Application test
- *
  */
 public class AppTest {
 

singleton/src/test/java/com/iluwatar/singleton/EnumIvoryTowerTest.java

@@ -24,14 +24,14 @@
 package com.iluwatar.singleton;
 
 /**
- * Date: 12/29/15 - 19:20 PM
+ * Date: 12/29/15 - 19:20 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class EnumIvoryTowerTest extends SingletonTest<EnumIvoryTower> {
 
   /**
-   * Create a new singleton test instance using the given 'getInstance' method
+   * Create a new singleton test instance using the given 'getInstance' method.
    */
   public EnumIvoryTowerTest() {
     super(() -> EnumIvoryTower.INSTANCE);

singleton/src/test/java/com/iluwatar/singleton/InitializingOnDemandHolderIdiomTest.java

@@ -24,14 +24,15 @@
 package com.iluwatar.singleton;
 
 /**
- * Date: 12/29/15 - 19:22 PM
+ * Date: 12/29/15 - 19:22 PM.
  *
  * @author Jeroen Meulemeester
  */
-public class InitializingOnDemandHolderIdiomTest extends SingletonTest<InitializingOnDemandHolderIdiom> {
+public class InitializingOnDemandHolderIdiomTest
+        extends SingletonTest<InitializingOnDemandHolderIdiom> {
 
   /**
-   * Create a new singleton test instance using the given 'getInstance' method
+   * Create a new singleton test instance using the given 'getInstance' method.
    */
   public InitializingOnDemandHolderIdiomTest() {
     super(InitializingOnDemandHolderIdiom::getInstance);

singleton/src/test/java/com/iluwatar/singleton/IvoryTowerTest.java

@@ -24,14 +24,14 @@
 package com.iluwatar.singleton;
 
 /**
- * Date: 12/29/15 - 19:23 PM
+ * Date: 12/29/15 - 19:23 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class IvoryTowerTest extends SingletonTest<IvoryTower> {
 
   /**
-   * Create a new singleton test instance using the given 'getInstance' method
+   * Create a new singleton test instance using the given 'getInstance' method.
    */
   public IvoryTowerTest() {
     super(IvoryTower::getInstance);

singleton/src/test/java/com/iluwatar/singleton/SingletonTest.java

@@ -23,8 +23,10 @@
 
 package com.iluwatar.singleton;
 
-import org.junit.jupiter.api.Disabled;
+import static java.time.Duration.ofMillis;
-import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTimeout;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -34,19 +36,17 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.function.Supplier;
 
-import static java.time.Duration.ofMillis;
+import org.junit.jupiter.api.Test;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
-import static org.junit.jupiter.api.Assertions.assertSame;
-import static org.junit.jupiter.api.Assertions.assertTimeout;
 
 /**
- * This class provides several test case that test singleton construction.
+ * <p>This class provides several test case that test singleton construction.</p>
  *
- * The first proves that multiple calls to the singleton getInstance object are the same when called
+ * <p>The first proves that multiple calls to the singleton getInstance object are the same when
- * in the SAME thread. The second proves that multiple calls to the singleton getInstance object are
+ * called in the SAME thread. The second proves that multiple calls to the singleton getInstance
- * the same when called in the DIFFERENT thread.
+ * object are the same when called in the DIFFERENT thread.</p>
+ *
+ * <p>Date: 12/29/15 - 19:25 PM</p>
  *
- * Date: 12/29/15 - 19:25 PM
  * @param <S> Supplier method generating singletons
  * @author Jeroen Meulemeester
  * @author Richard Jones
@@ -54,12 +54,12 @@ import static org.junit.jupiter.api.Assertions.assertTimeout;
 public abstract class SingletonTest<S> {
 
   /**
-   * The singleton's getInstance method
+   * The singleton's getInstance method.
    */
   private final Supplier<S> singletonInstanceMethod;
 
   /**
-   * Create a new singleton test instance using the given 'getInstance' method
+   * Create a new singleton test instance using the given 'getInstance' method.
    *
    * @param singletonInstanceMethod The singleton's getInstance method
    */
@@ -68,7 +68,7 @@ public abstract class SingletonTest<S> {
   }
 
   /**
-   * Test the singleton in a non-concurrent setting
+   * Test the singleton in a non-concurrent setting.
    */
   @Test
   public void testMultipleCallsReturnTheSameObjectInSameThread() {
@@ -83,7 +83,7 @@ public abstract class SingletonTest<S> {
   }
 
   /**
-   * Test singleton instance in a concurrent setting
+   * Test singleton instance in a concurrent setting.
    */
   @Test
   public void testMultipleCallsReturnTheSameObjectInDifferentThreads() throws Exception {

singleton/src/test/java/com/iluwatar/singleton/ThreadSafeDoubleCheckLockingTest.java

@@ -23,34 +23,35 @@
 
 package com.iluwatar.singleton;
 
-import org.junit.Test;
-
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 
+import org.junit.Test;
+
 /**
- * Date: 12/29/15 - 19:26 PM
+ * Date: 12/29/15 - 19:26 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class ThreadSafeDoubleCheckLockingTest extends SingletonTest<ThreadSafeDoubleCheckLocking> {
 
   /**
-   * Create a new singleton test instance using the given 'getInstance' method
+   * Create a new singleton test instance using the given 'getInstance' method.
    */
   public ThreadSafeDoubleCheckLockingTest() {
     super(ThreadSafeDoubleCheckLocking::getInstance);
   }
 
   /**
-   * Test creating new instance by refection
+   * Test creating new instance by refection.
    */
   @Test(expected = InvocationTargetException.class)
   public void testCreatingNewInstanceByRefection() throws Exception {
     ThreadSafeDoubleCheckLocking instance1 = ThreadSafeDoubleCheckLocking.getInstance();
     Constructor constructor = ThreadSafeDoubleCheckLocking.class.getDeclaredConstructor();
     constructor.setAccessible(true);
-    ThreadSafeDoubleCheckLocking instance2 = (ThreadSafeDoubleCheckLocking) constructor.newInstance(null);
+    ThreadSafeDoubleCheckLocking instance2 =
+            (ThreadSafeDoubleCheckLocking) constructor.newInstance(null);
   }
 
 }

singleton/src/test/java/com/iluwatar/singleton/ThreadSafeLazyLoadedIvoryTowerTest.java

@@ -24,14 +24,15 @@
 package com.iluwatar.singleton;
 
 /**
- * Date: 12/29/15 - 19:26 PM
+ * Date: 12/29/15 - 19:26 PM.
  *
  * @author Jeroen Meulemeester
  */
-public class ThreadSafeLazyLoadedIvoryTowerTest extends SingletonTest<ThreadSafeLazyLoadedIvoryTower> {
+public class ThreadSafeLazyLoadedIvoryTowerTest
+        extends SingletonTest<ThreadSafeLazyLoadedIvoryTower> {
 
   /**
-   * Create a new singleton test instance using the given 'getInstance' method
+   * Create a new singleton test instance using the given 'getInstance' method.
    */
   public ThreadSafeLazyLoadedIvoryTowerTest() {
     super(ThreadSafeLazyLoadedIvoryTower::getInstance);

strategy/src/main/java/com/iluwatar/strategy/App.java

@@ -28,15 +28,15 @@ import org.slf4j.LoggerFactory;
 
 /**
  * 
- * The Strategy pattern (also known as the policy pattern) is a software design pattern that enables
+ * <p>The Strategy pattern (also known as the policy pattern) is a software design pattern that
- * an algorithm's behavior to be selected at runtime.
+ * enables an algorithm's behavior to be selected at runtime.</p>
- * <p>
+ *
- * Before Java 8 the Strategies needed to be separate classes forcing the developer
+ * <p>Before Java 8 the Strategies needed to be separate classes forcing the developer
  * to write lots of boilerplate code. With modern Java it is easy to pass behavior
- * with method references and lambdas making the code shorter and more readable.
+ * with method references and lambdas making the code shorter and more readable.</p>
- * <p>
+ *
- * In this example ({@link DragonSlayingStrategy}) encapsulates an algorithm. The containing object
+ * <p>In this example ({@link DragonSlayingStrategy}) encapsulates an algorithm. The containing
- * ({@link DragonSlayer}) can alter its behavior by changing its strategy.
+ * object ({@link DragonSlayer}) can alter its behavior by changing its strategy.</p>
  * 
  */
 public class App {
@@ -44,7 +44,7 @@ public class App {
   private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
   
   /**
-   * Program entry point
+   * Program entry point.
    * 
    * @param args command line args
    */

strategy/src/main/java/com/iluwatar/strategy/DragonSlayer.java

@@ -24,9 +24,7 @@
 package com.iluwatar.strategy;
 
 /**
- * 
  * DragonSlayer uses different strategies to slay the dragon.
- * 
  */
 public class DragonSlayer {
 

strategy/src/main/java/com/iluwatar/strategy/DragonSlayingStrategy.java

@@ -24,9 +24,7 @@
 package com.iluwatar.strategy;
 
 /**
- * 
  * Strategy interface.
- * 
  */
 @FunctionalInterface
 public interface DragonSlayingStrategy {

strategy/src/main/java/com/iluwatar/strategy/MeleeStrategy.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
  * Melee strategy.
- *
  */
 public class MeleeStrategy implements DragonSlayingStrategy {
 

strategy/src/main/java/com/iluwatar/strategy/ProjectileStrategy.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
  * Projectile strategy.
- *
  */
 public class ProjectileStrategy implements DragonSlayingStrategy {
 

strategy/src/main/java/com/iluwatar/strategy/SpellStrategy.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
  * Spell strategy.
- *
  */
 public class SpellStrategy implements DragonSlayingStrategy {
 

strategy/src/test/java/com/iluwatar/strategy/AppTest.java

@@ -26,9 +26,7 @@ package com.iluwatar.strategy;
 import org.junit.jupiter.api.Test;
 
 /**
- * 
+ * Application test.
- * Application test
- *
  */
 public class AppTest {
 

strategy/src/test/java/com/iluwatar/strategy/DragonSlayerTest.java

@@ -23,21 +23,21 @@
 
 package com.iluwatar.strategy;
 
-import org.junit.jupiter.api.Test;
-
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 
+import org.junit.jupiter.api.Test;
+
 /**
- * Date: 12/29/15 - 10:50 PM
+ * Date: 12/29/15 - 10:50 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class DragonSlayerTest {
 
   /**
-   * Verify if the dragon slayer uses the strategy during battle
+   * Verify if the dragon slayer uses the strategy during battle.
    */
   @Test
   public void testGoToBattle() {
@@ -50,7 +50,7 @@ public class DragonSlayerTest {
   }
 
   /**
-   * Verify if the dragon slayer uses the new strategy during battle after a change of strategy
+   * Verify if the dragon slayer uses the new strategy during battle after a change of strategy.
    */
   @Test
   public void testChangeStrategy() {

strategy/src/test/java/com/iluwatar/strategy/DragonSlayingStrategyTest.java

@@ -23,29 +23,32 @@
 
 package com.iluwatar.strategy;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.spi.ILoggingEvent;
 import ch.qos.logback.core.AppenderBase;
+
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.slf4j.LoggerFactory;
 
-import java.util.Collection;
-import java.util.LinkedList;
-import java.util.List;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 /**
- * Date: 12/29/15 - 10:58 PM
+ * Date: 12/29/15 - 10:58 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class DragonSlayingStrategyTest {
 
   /**
+   * Assembles test parameters.
+   *
    * @return The test parameters for each cycle
    */
   static Collection<Object[]> dataProvider() {
@@ -79,7 +82,7 @@ public class DragonSlayingStrategyTest {
 
 
   /**
-   * Test if executing the strategy gives the correct response
+   * Test if executing the strategy gives the correct response.
    */
   @ParameterizedTest
   @MethodSource("dataProvider")

visitor/src/main/java/com/iluwatar/visitor/App.java

@@ -24,19 +24,18 @@
 package com.iluwatar.visitor;
 
 /**
+ * <p>Visitor pattern defines mechanism to apply operations on nodes in hierarchy. New operations
+ * can be added without altering the node interface.</p>
  *
- * Visitor pattern defines mechanism to apply operations on nodes in hierarchy. New operations can
+ * <p>In this example there is a unit hierarchy beginning from {@link Commander}. This hierarchy is
- * be added without altering the node interface.
- * <p>
- * In this example there is a unit hierarchy beginning from {@link Commander}. This hierarchy is
  * traversed by visitors. {@link SoldierVisitor} applies its operation on {@link Soldier}s,
- * {@link SergeantVisitor} on {@link Sergeant}s and so on.
+ * {@link SergeantVisitor} on {@link Sergeant}s and so on.</p>
  * 
  */
 public class App {
 
   /**
-   * Program entry point
+   * Program entry point.
    * 
    * @param args command line args
    */

visitor/src/main/java/com/iluwatar/visitor/Commander.java

@@ -24,9 +24,7 @@
 package com.iluwatar.visitor;
 
 /**
- * 
+ * Commander.
- * Commander
- *
  */
 public class Commander extends Unit {
 

visitor/src/main/java/com/iluwatar/visitor/CommanderVisitor.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
+ * CommanderVisitor.
- * CommanderVisitor
- *
  */
 public class CommanderVisitor implements UnitVisitor {
 

visitor/src/main/java/com/iluwatar/visitor/Sergeant.java

@@ -24,9 +24,7 @@
 package com.iluwatar.visitor;
 
 /**
- * 
+ * Sergeant.
- * Sergeant
- *
  */
 public class Sergeant extends Unit {
 

visitor/src/main/java/com/iluwatar/visitor/SergeantVisitor.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
+ * SergeantVisitor.
- * SergeantVisitor
- *
  */
 public class SergeantVisitor implements UnitVisitor {
 

visitor/src/main/java/com/iluwatar/visitor/Soldier.java

@@ -24,9 +24,7 @@
 package com.iluwatar.visitor;
 
 /**
- * 
+ * Soldier.
- * Soldier
- *
  */
 public class Soldier extends Unit {
 

visitor/src/main/java/com/iluwatar/visitor/SoldierVisitor.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
+ * SoldierVisitor.
- * SoldierVisitor
- *
  */
 public class SoldierVisitor implements UnitVisitor {
 

visitor/src/main/java/com/iluwatar/visitor/Unit.java

@@ -24,9 +24,7 @@
 package com.iluwatar.visitor;
 
 /**
- * 
  * Interface for the nodes in hierarchy.
- * 
  */
 public abstract class Unit {
 
@@ -37,7 +35,7 @@ public abstract class Unit {
   }
 
   /**
-   * Accept visitor
+   * Accept visitor.
    */
   public void accept(UnitVisitor visitor) {
     for (var child : children) {

visitor/src/main/java/com/iluwatar/visitor/UnitVisitor.java

@@ -24,9 +24,7 @@
 package com.iluwatar.visitor;
 
 /**
- * 
  * Visitor interface.
- * 
  */
 public interface UnitVisitor {
 

visitor/src/test/java/com/iluwatar/visitor/AppTest.java

@@ -26,9 +26,7 @@ package com.iluwatar.visitor;
 import org.junit.jupiter.api.Test;
 
 /**
- * 
+ * Application test.
- * Application test
- *
  */
 public class AppTest {
 

visitor/src/test/java/com/iluwatar/visitor/CommanderTest.java

@@ -27,14 +27,14 @@ import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.verify;
 
 /**
- * Date: 12/30/15 - 19:45 PM
+ * Date: 12/30/15 - 19:45 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class CommanderTest extends UnitTest<Commander> {
 
   /**
-   * Create a new test instance for the given {@link Commander}
+   * Create a new test instance for the given {@link Commander}.
    */
   public CommanderTest() {
     super(Commander::new);

visitor/src/test/java/com/iluwatar/visitor/CommanderVisitorTest.java

@@ -26,14 +26,14 @@ package com.iluwatar.visitor;
 import java.util.Optional;
 
 /**
- * Date: 12/30/15 - 18:43 PM
+ * Date: 12/30/15 - 18:43 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class CommanderVisitorTest extends VisitorTest<CommanderVisitor> {
 
   /**
-   * Create a new test instance for the given visitor
+   * Create a new test instance for the given visitor.
    */
   public CommanderVisitorTest() {
     super(

visitor/src/test/java/com/iluwatar/visitor/SergeantTest.java

@@ -27,14 +27,14 @@ import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.verify;
 
 /**
- * Date: 12/30/15 - 19:45 PM
+ * Date: 12/30/15 - 19:45 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class SergeantTest extends UnitTest<Sergeant> {
 
   /**
-   * Create a new test instance for the given {@link Sergeant}
+   * Create a new test instance for the given {@link Sergeant}.
    */
   public SergeantTest() {
     super(Sergeant::new);

visitor/src/test/java/com/iluwatar/visitor/SergeantVisitorTest.java

@@ -26,14 +26,14 @@ package com.iluwatar.visitor;
 import java.util.Optional;
 
 /**
- * Date: 12/30/15 - 18:36 PM
+ * Date: 12/30/15 - 18:36 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class SergeantVisitorTest extends VisitorTest<SergeantVisitor> {
 
   /**
-   * Create a new test instance for the given visitor
+   * Create a new test instance for the given visitor.
    */
   public SergeantVisitorTest() {
     super(

visitor/src/test/java/com/iluwatar/visitor/SoldierTest.java

@@ -27,14 +27,14 @@ import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.verify;
 
 /**
- * Date: 12/30/15 - 19:45 PM
+ * Date: 12/30/15 - 19:45 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class SoldierTest extends UnitTest<Soldier> {
 
   /**
-   * Create a new test instance for the given {@link Soldier}
+   * Create a new test instance for the given {@link Soldier}.
    */
   public SoldierTest() {
     super(Soldier::new);

visitor/src/test/java/com/iluwatar/visitor/SoldierVisitorTest.java

@@ -26,14 +26,14 @@ package com.iluwatar.visitor;
 import java.util.Optional;
 
 /**
- * Date: 12/30/15 - 18:59 PM
+ * Date: 12/30/15 - 18:59 PM.
  *
  * @author Jeroen Meulemeester
  */
 public class SoldierVisitorTest extends VisitorTest<SoldierVisitor> {
 
   /**
-   * Create a new test instance for the given visitor
+   * Create a new test instance for the given visitor.
    */
   public SoldierVisitorTest() {
     super(

visitor/src/test/java/com/iluwatar/visitor/UnitTest.java

@@ -23,18 +23,18 @@
 
 package com.iluwatar.visitor;
 
-import org.junit.jupiter.api.Test;
-
-import java.util.Arrays;
-import java.util.function.Function;
-
 import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 
+import java.util.Arrays;
+import java.util.function.Function;
+
+import org.junit.jupiter.api.Test;
+
 /**
- * Date: 12/30/15 - 18:59 PM
+ * Date: 12/30/15 - 18:59 PM.
  * Test related to Units
  * @param <U> Type of Unit
  * @author Jeroen Meulemeester
@@ -42,12 +42,12 @@ import static org.mockito.Mockito.verifyNoMoreInteractions;
 public abstract class UnitTest<U extends Unit> {
 
   /**
-   * Factory to create new instances of the tested unit
+   * Factory to create new instances of the tested unit.
    */
   private final Function<Unit[], U> factory;
 
   /**
-   * Create a new test instance for the given unit type {@link U}
+   * Create a new test instance for the given unit type {@link U}.
    *
    * @param factory Factory to create new instances of the tested unit
    */
@@ -74,7 +74,7 @@ public abstract class UnitTest<U extends Unit> {
   }
 
   /**
-   * Verify if the correct visit method is called on the mock, depending on the tested instance
+   * Verify if the correct visit method is called on the mock, depending on the tested instance.
    *
    * @param unit          The tested unit instance
    * @param mockedVisitor The mocked {@link UnitVisitor} who should have gotten a visit by the unit

visitor/src/test/java/com/iluwatar/visitor/VisitorTest.java

@@ -23,6 +23,8 @@
 
 package com.iluwatar.visitor;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.spi.ILoggingEvent;
 import ch.qos.logback.core.AppenderBase;
@@ -35,10 +37,8 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.slf4j.LoggerFactory;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 /**
- * Date: 12/30/15 - 18:59 PM
+ * Date: 12/30/15 - 18:59 PM.
  * Test case for Visitor Pattern
  * @param <V> Type of UnitVisitor
  * @author Jeroen Meulemeester
@@ -58,34 +58,36 @@ public abstract class VisitorTest<V extends UnitVisitor> {
   }
 
   /**
-   * The tested visitor instance
+   * The tested visitor instance.
    */
   private final V visitor;
 
   /**
-   * The optional expected response when being visited by a commander
+   * The optional expected response when being visited by a commander.
    */
   private final Optional<String> commanderResponse;
 
   /**
-   * The optional expected response when being visited by a sergeant
+   * The optional expected response when being visited by a sergeant.
    */
   private final Optional<String> sergeantResponse;
 
   /**
-   * The optional expected response when being visited by a soldier
+   * The optional expected response when being visited by a soldier.
    */
   private final Optional<String> soldierResponse;
 
   /**
-   * Create a new test instance for the given visitor
+   * Create a new test instance for the given visitor.
    *
    * @param commanderResponse The optional expected response when being visited by a commander
    * @param sergeantResponse  The optional expected response when being visited by a sergeant
    * @param soldierResponse   The optional expected response when being visited by a soldier
    */
-  public VisitorTest(final V visitor, final Optional<String> commanderResponse,
+  public VisitorTest(final V visitor,
-                     final Optional<String> sergeantResponse, final Optional<String> soldierResponse) {
+                     final Optional<String> commanderResponse,
+                     final Optional<String> sergeantResponse,
+                     final Optional<String> soldierResponse) {
 
     this.visitor = visitor;
     this.commanderResponse = commanderResponse;