Resolves checkstyle errors for collection-pipeline, command, commander (#1061)

* Reduces checkstyle errors in collection-pipeline

* Reduces checkstyle errors in command

* Reduces checkstyle errors in commander

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

@@ -24,31 +24,28 @@
 package com.iluwatar.command;
 
 /**
- * 
  * The Command pattern is a behavioral design pattern in which an object is used to encapsulate all
  * information needed to perform an action or trigger an event at a later time. This information
  * includes the method name, the object that owns the method and values for the method parameters.
- * <p>
- * Four terms always associated with the command pattern are command, receiver, invoker and client.
- * A command object (spell) knows about the receiver (target) and invokes a method of the receiver.
- * Values for parameters of the receiver method are stored in the command. The receiver then does
- * the work. An invoker object (wizard) knows how to execute a command, and optionally does
- * bookkeeping about the command execution. The invoker does not know anything about a concrete
+ *
+ * <p>Four terms always associated with the command pattern are command, receiver, invoker and
+ * client. A command object (spell) knows about the receiver (target) and invokes a method of the
+ * receiver. Values for parameters of the receiver method are stored in the command. The receiver
+ * then does the work. An invoker object (wizard) knows how to execute a command, and optionally
+ * does bookkeeping about the command execution. The invoker does not know anything about a concrete
  * command, it knows only about command interface. Both an invoker object and several command
  * objects are held by a client object (app). The client decides which commands to execute at which
  * points. To execute a command, it passes the command object to the invoker object.
- * <p>
- * In other words, in this example the wizard casts spells on the goblin. The wizard keeps track of
- * the previous spells cast, so it is easy to undo them. In addition, the wizard keeps track of the
- * spells undone, so they can be redone.
- * 
- * 
+ *
+ * <p>In other words, in this example the wizard casts spells on the goblin. The wizard keeps track
+ * of the previous spells cast, so it is easy to undo them. In addition, the wizard keeps track of
+ * the spells undone, so they can be redone.
  */
 public class App {
 
   /**
-   * Program entry point
-   * 
+   * Program entry point.
+   *
    * @param args command line args
    */
   public static void main(String[] args) {

command/src/main/java/com/iluwatar/command/Command.java

@@ -24,9 +24,7 @@
 package com.iluwatar.command;
 
 /**
- * 
  * Interface for Commands.
- * 
  */
 public abstract class Command {
 

command/src/main/java/com/iluwatar/command/Goblin.java

@@ -24,9 +24,7 @@
 package com.iluwatar.command;
 
 /**
- * 
- * Goblin is the target of the spells
- *
+ * Goblin is the target of the spells.
  */
 public class Goblin extends Target {
 

command/src/main/java/com/iluwatar/command/InvisibilitySpell.java

@@ -24,9 +24,7 @@
 package com.iluwatar.command;
 
 /**
- * 
- * InvisibilitySpell is a concrete command
- *
+ * InvisibilitySpell is a concrete command.
  */
 public class InvisibilitySpell extends Command {
 

command/src/main/java/com/iluwatar/command/ShrinkSpell.java

@@ -24,9 +24,7 @@
 package com.iluwatar.command;
 
 /**
- * 
- * ShrinkSpell is a concrete command
- *
+ * ShrinkSpell is a concrete command.
  */
 public class ShrinkSpell extends Command {
 

command/src/main/java/com/iluwatar/command/Size.java

@@ -24,9 +24,7 @@
 package com.iluwatar.command;
 
 /**
- *
  * Enumeration for target size.
- *
  */
 public enum Size {
 

command/src/main/java/com/iluwatar/command/Target.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
  * Base class for spell targets.
- *
  */
 public abstract class Target {
 
@@ -59,7 +57,7 @@ public abstract class Target {
   public abstract String toString();
 
   /**
-   * Print status
+   * Print status.
    */
   public void printStatus() {
     LOGGER.info("{}, [size={}] [visibility={}]", this, getSize(), getVisibility());

command/src/main/java/com/iluwatar/command/Visibility.java

@@ -24,9 +24,7 @@
 package com.iluwatar.command;
 
 /**
- * 
  * Enumeration for target visibility.
- *
  */
 public enum Visibility {
 

command/src/main/java/com/iluwatar/command/Wizard.java

@@ -23,16 +23,13 @@
 
 package com.iluwatar.command;
 
+import java.util.Deque;
+import java.util.LinkedList;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.Deque;
-import java.util.LinkedList;
-
 /**
- * 
- * Wizard is the invoker of the commands
- *
+ * Wizard is the invoker of the commands.
  */
 public class Wizard {
 
@@ -46,7 +43,7 @@ public class Wizard {
   }
 
   /**
-   * Cast spell
+   * Cast spell.
    */
   public void castSpell(Command command, Target target) {
     LOGGER.info("{} casts {} at {}", this, command, target);
@@ -55,7 +52,7 @@ public class Wizard {
   }
 
   /**
-   * Undo last spell
+   * Undo last spell.
    */
   public void undoLastSpell() {
     if (!undoStack.isEmpty()) {
@@ -67,7 +64,7 @@ public class Wizard {
   }
 
   /**
-   * Redo last spell
+   * Redo last spell.
    */
   public void redoLastSpell() {
     if (!redoStack.isEmpty()) {