Fixed the code as per review comments

radhe-sravan · radhe-sravan · commit 399aaad0c1d8 · 2019-11-27T06:27:24.000+05:30
diff --git a/data-structures/src/main/java/com/baeldung/list/CircularLinkedList.java b/data-structures/src/main/java/com/baeldung/list/CircularLinkedList.java
@@ -1,40 +1,37 @@
 package com.baeldung.list;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class CircularLinkedList {
 
-    Node head = null;
-    Node tail = null;
+    final Logger LOGGER = LoggerFactory.getLogger(CircularLinkedList.class);
+
+    private Node head = null;
+    private Node tail = null;
 
     public void addNode(int value) {
 
         Node newNode = new Node(value);
 
-        // If no elements are present, make the newly addNodeed node as head
         if (head == null) {
             head = newNode;
-        }
-        // If there are elements already present, the existing tail should point to new node
-        else {
+        } else {
             tail.nextNode = newNode;
         }
 
-        // Irrespective of whether or not elements are added, assign the
-        // tail to newNode and the nextNode for tail as head
         tail = newNode;
         tail.nextNode = head;
     }
 
     public boolean containsNode(int searchValue) {
 
-        // Start traversing from the head
         Node currentNode = head;
 
-        // If list is empty no need of traversal and can return false
         if (head == null) {
             return false;
         } else {
             do {
-                // Compares the search value with each node value present in the list
                 if (currentNode.value == searchValue) {
                     return true;
                 }
@@ -46,24 +43,16 @@ public boolean containsNode(int searchValue) {
 
     public void deleteNode(int valueToDelete) {
 
-        // Start traversing from the head
         Node currentNode = head;
 
-        // If list is non empty
         if (head != null) {
-            // If the node to delete is the head node itself,
-            // update the head as the next node of current head
-            // and the nextNode of tail as new head
             if (currentNode.value == valueToDelete) {
                 head = head.nextNode;
                 tail.nextNode = head;
                 currentNode = null;
             } else {
                 do {
-                    // Fetch the next node of current node
                     Node nextNode = currentNode.nextNode;
-                    // If the value to delete matches the next node's value,
-                    // update the next node of current node as the next node of present next node
                     if (nextNode.value == valueToDelete) {
                         currentNode.nextNode = nextNode.nextNode;
                         nextNode = null;
@@ -77,12 +66,11 @@ public void deleteNode(int valueToDelete) {
 
     public void traverseList() {
 
-        // Start traversing from the head
         Node currentNode = head;
 
         if (head != null) {
             do {
-                System.out.print(currentNode.value + " ");
+                LOGGER.info(currentNode.value + " ");
                 currentNode = currentNode.nextNode;
             } while (currentNode != head);
         }
@@ -99,4 +87,4 @@ public Node(int value) {
         this.value = value;
     }
 
-}
+}
diff --git a/data-structures/src/test/java/com/baeldung/list/CircularLinkedListUnitTest.java b/data-structures/src/test/java/com/baeldung/list/CircularLinkedListUnitTest.java
@@ -9,41 +9,37 @@ public class CircularLinkedListUnitTest {
 
     @Test
     public void givenACircularLinkedList_WhenAddingElements_ThenListContainsThoseElements() {
-
         CircularLinkedList cll = createCircularLinkedList();
 
         assertTrue(cll.containsNode(8));
         assertTrue(cll.containsNode(37));
     }
-    
+
     @Test
     public void givenACircularLinkedList_WhenLookingForNonExistingElement_ThenReturnsFalse() {
-
         CircularLinkedList cll = createCircularLinkedList();
 
         assertFalse(cll.containsNode(11));
     }
-    
+
     @Test
     public void givenACircularLinkedList_WhenDeletingElements_ThenListDoesNotContainThoseElements() {
-
         CircularLinkedList cll = createCircularLinkedList();
 
         assertTrue(cll.containsNode(13));
         cll.deleteNode(13);
         assertFalse(cll.containsNode(13));
-        
+
         assertTrue(cll.containsNode(1));
         cll.deleteNode(1);
         assertFalse(cll.containsNode(1));
-        
+
         assertTrue(cll.containsNode(46));
         cll.deleteNode(46);
-        assertFalse(cll.containsNode(46));  
+        assertFalse(cll.containsNode(46));
     }
 
     private CircularLinkedList createCircularLinkedList() {
-
         CircularLinkedList cll = new CircularLinkedList();
 
         cll.addNode(13);
