add Javadoc and comments for issue

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

@@ -32,8 +32,13 @@ public Commander(Unit... children) {
     super(children);
   }
 
+  /**
+   * Accept a Visitor.
+   * @param visitor
+   */
   @Override
   public void accept(UnitVisitor visitor) {
+    //CS304 Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
     visitor.visit(this);
     super.accept(visitor);
   }

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

@@ -30,17 +30,30 @@
  */
 @Slf4j
 public class CommanderVisitor implements UnitVisitor {
+  //CS304 Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
 
+  /**
+   * Soldier Visitor method.
+   * @param soldier
+   */
   @Override
   public void visit(Soldier soldier) {
     // Do nothing
   }
 
+  /**
+   * Sergeant Visitor method.
+   * @param sergeant
+   */
   @Override
   public void visit(Sergeant sergeant) {
     // Do nothing
   }
 
+  /**
+   * Commander Visitor method.
+   * @param commander
+   */
   @Override
   public void visit(Commander commander) {
     LOGGER.info("Good to see you {}", commander);

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

@@ -32,8 +32,13 @@ public Sergeant(Unit... children) {
     super(children);
   }
 
+  /**
+   * Accept a visitor.
+   * @param visitor
+   */
   @Override
   public void accept(UnitVisitor visitor) {
+    //CS304 Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
     visitor.visit(this);
     super.accept(visitor);
   }

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

@@ -30,17 +30,30 @@
  */
 @Slf4j
 public class SergeantVisitor implements UnitVisitor {
+  //CS304 Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
 
+  /**
+   * Soldier Visitor method.
+   * @param soldier
+   */
   @Override
   public void visit(Soldier soldier) {
     // Do nothing
   }
 
+  /**
+   * Sergeant Visitor method.
+   * @param sergeant
+   */
   @Override
   public void visit(Sergeant sergeant) {
     LOGGER.info("Hello {}", sergeant);
   }
 
+  /**
+   * Commander Visitor method.
+   * @param commander
+   */
   @Override
   public void visit(Commander commander) {
     // Do nothing

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

@@ -32,8 +32,13 @@ public Soldier(Unit... children) {
     super(children);
   }
 
+  /**
+   * Accept a visitor.
+   * @param visitor
+   */
   @Override
   public void accept(UnitVisitor visitor) {
+    //CS304 Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
     visitor.visit(this);
     super.accept(visitor);
   }

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

@@ -31,16 +31,30 @@
 @Slf4j
 public class SoldierVisitor implements UnitVisitor {
 
+  //CS304 Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
+
+  /**
+   * Soldier visitor method.
+   * @param soldier
+   */
   @Override
   public void visit(Soldier soldier) {
     LOGGER.info("Greetings {}", soldier);
   }
 
+  /**
+   * Sergeant visitor method.
+   * @param sergeant
+   */
   @Override
   public void visit(Sergeant sergeant) {
     // Do nothing
   }
 
+  /**
+   * Commander visitor method.
+   * @param commander
+   */
   @Override
   public void visit(Commander commander) {
     // Do nothing

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

@@ -28,10 +28,24 @@
  */
 public interface UnitVisitor {
 
+  //CS304 Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
+
+  /**
+   * Soldier visit method.
+   * @param soldier
+   */
   void visit(Soldier soldier);
 
+  /**
+   * Sergeant visit method.
+   * @param sergeant
+   */
   void visit(Sergeant sergeant);
 
+  /**
+   * Commander visit method.
+   * @param commander
+   */
   void visit(Commander commander);
 
 }

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

@@ -42,6 +42,7 @@ public CommanderTest() {
 
   @Override
   void verifyVisit(Commander unit, UnitVisitor mockedVisitor) {
+    //CS304 (manually written) Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
     verify(mockedVisitor).visit(eq(unit));
   }
 

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

@@ -42,6 +42,7 @@ public SergeantTest() {
 
   @Override
   void verifyVisit(Sergeant unit, UnitVisitor mockedVisitor) {
+    //CS304 (manually written) Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
     verify(mockedVisitor).visit(eq(unit));
   }
 

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

@@ -42,6 +42,7 @@ public SoldierTest() {
 
   @Override
   void verifyVisit(Soldier unit, UnitVisitor mockedVisitor) {
+    //CS304 (manually written) Issue link: https://github.com/iluwatar/java-design-patterns/issues/1968
     verify(mockedVisitor).visit(eq(unit));
   }