Added Doubly Linked List.java

Java/DoublyLinkedList.java

@@ -0,0 +1,63 @@
+public class DoublyLinkedList {  
+
+    class Node{  
+        int data;  
+        Node previous;  
+        Node next;  
+
+        public Node(int data) {  
+            this.data = data;  
+        }  
+    }  
+
+
+    Node head, tail = null;  
+
+
+    public void addNode(int data) {  
+
+        Node newNode = new Node(data);  
+
+
+        if(head == null) {  
+
+            head = tail = newNode;  
+
+            head.previous = null;  
+
+            tail.next = null;  
+        }  
+        else {  
+     tail.next = newNode; 
+            newNode.previous = tail;  
+            tail = newNode;
+            tail.next = null;  
+        }  
+    }  
+
+    public void display() {
+        Node current = head;  
+        if(head == null) {  
+            System.out.println("List is empty");  
+            return;  
+        }  
+        System.out.println("Nodes of doubly linked list: ");  
+        while(current != null) { 
+
+            System.out.print(current.data + " ");  
+            current = current.next;  
+        }  
+    }  
+
+    public static void main(String[] args) {  
+
+        DoublyLinkedList dList = new DoublyLinkedList();  
+        dList.addNode(1);  
+        dList.addNode(2);  
+        dList.addNode(3);  
+        dList.addNode(4);  
+        dList.addNode(5);  
+
+        dList.display();  
+    }  
+}