Adding these files to the package

fourthassignment/src/main/java/com/ds/fourthassignment/CircularLinkedList.java

+package com.ds.fourthassignment;
+
+public class CircularLinkedList {
+	private LNode head; 
+	private LNode tail; 
+	private int size; 
+	
+	
+	public CircularLinkedList(){
+		head= null; 
+		tail = null; 
+		size =0;
+	}
+	
+	public void addToHead(LNode newNode){
+		//adding to head:
+		if(head==null){
+			head = newNode; 
+			tail = head;
+		}
+		else{
+			//update head
+			newNode.setNext(head); 
+			tail.setNext(newNode); 
+			head = newNode; 
+		}
+		size++; 
+	}
+	
+	
+	public void addToTail(LNode newNode){
+		if(tail==null){
+			tail = newNode; 
+			head= tail; 
+		}
+		else{
+			//update tail
+			tail.setNext(newNode);
+			newNode.setNext(head);
+			tail = newNode;
+		}
+		size++;
+	}
+	
+	
+	public String display(){
+		String out=""; 
+		if (head==null) return null;
+		LNode current = head; 
+		do{
+			out+=current.getData() +",";
+			if (current==tail) break;
+			current = current.getNext(); 
+		}while(current!=null);
+		return out;
+	}
+	
+	public boolean isEmpty(){ return (head==null ? true : false); }
+	public int getSize() { return size; }
+	
+}
\ No newline at end of file

fourthassignment/src/main/java/com/ds/fourthassignment/DoublyLNode.java

+package com.ds.fourthassignment;
+
 public class DoublyLNode {
 
 	private String data; 

fourthassignment/src/main/java/com/ds/fourthassignment/DoublyLinkedList.java

+package com.ds.fourthassignment;
+
 public class DoublyLinkedList {
 
 	private DoublyLNode head;

fourthassignment/src/main/java/com/ds/fourthassignment/LNode.java

+package com.ds.fourthassignment;
+
 public class LNode {
 	
 	Integer data;

fourthassignment/src/main/java/com/ds/fourthassignment/TNode.java

 package com.ds.fourthassignment;
 
-
 public class TNode {
 	
 	private Scientist data;