#590 Add explanation for Composite pattern

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

@@ -51,9 +51,7 @@ public class App {
     LetterComposite orcMessage = new Messenger().messageFromOrcs();
     orcMessage.print();
 
-    LOGGER.info("\n");
-
-    LOGGER.info("Message from the elves: ");
+    LOGGER.info("\nMessage from the elves: ");
 
     LetterComposite elfMessage = new Messenger().messageFromElves();
     elfMessage.print();

composite/src/main/java/com/iluwatar/composite/Letter.java

@@ -39,9 +39,4 @@ public class Letter extends LetterComposite {
   protected void printThisBefore() {
     System.out.print(c);
   }
-
-  @Override
-  protected void printThisAfter() {
-    // nop
-  }
 }

composite/src/main/java/com/iluwatar/composite/LetterComposite.java

@@ -42,9 +42,9 @@ public abstract class LetterComposite {
     return children.size();
   }
 
-  protected abstract void printThisBefore();
+  protected void printThisBefore() {}
 
-  protected abstract void printThisAfter();
+  protected void printThisAfter() {}
 
   /**
    * Print

composite/src/main/java/com/iluwatar/composite/Sentence.java

@@ -40,11 +40,6 @@ public class Sentence extends LetterComposite {
     }
   }
 
-  @Override
-  protected void printThisBefore() {
-    // nop
-  }
-
   @Override
   protected void printThisAfter() {
     System.out.print(".");

composite/src/main/java/com/iluwatar/composite/Word.java

@@ -44,9 +44,4 @@ public class Word extends LetterComposite {
   protected void printThisBefore() {
     System.out.print(" ");
   }
-
-  @Override
-  protected void printThisAfter() {
-    // nop
-  }
 }