Creating own circular list in java

class CircularLinkedList {

    private Node first;
    private Node last;
    private int size;

    public CircularLinkedList() {
        first = last = null;
        size=0;
    }

    public void add(String value){

        Node current = new Node(null, null, value);
        if(first == null){
            first = current;
            current.setNext(first);
            current.setPrev(first);
            last = first;
        }else {
            last.setNext(current);
            current.setPrev(last);
            last = current;
            last.setNext(first);
            first.setPrev(last);
        }
        size++;
    }

    public void traverseRight(){
        System.out.print("Traversing right: ");
        Node current = first;
        do{
            System.out.print(current.value+" ");
            current = current.next;
        }while(current != first);
        System.out.println("");
    }

    public void traverseLeft(){
        System.out.print("Traversing left: ");
        Node current = first;
        do{
            System.out.print(current.value+" ");
            current = current.prev;
        }while(current != first);
        System.out.println("");
    }

    public void traverseLeft(int count){
        System.out.print("Traversing left "+count+": ");
        Node current = first;
        do{
            System.out.print(current.value+" ");
            current = current.prev;
        }while(count-- > 0);
        System.out.println("");
    }

    public int getSize(){
        return size;
    }

    static class Node {
        private String value;
        private Node next;
        private Node prev;

        public Node(Node next, Node prev, String value){
            this.next = next;
            this.value = value;
            this.prev = prev;
        }

        public void setNext(Node next) {
            this.next = next;
        }

        public void setPrev(Node prev) {
            this.prev = prev;
        }
    }
}

public class CircularList {

    public static void main(String a[]) {
        CircularLinkedList linkedList = new CircularLinkedList();
        linkedList.add("1");
        linkedList.add("2");
        linkedList.add("3");
        linkedList.add("4");
        linkedList.add("5");
        linkedList.add("6");
        linkedList.add("7");
        linkedList.traverseRight();
        linkedList.traverseLeft();
        linkedList.traverseLeft(3);
        System.out.println("List size: " +linkedList.getSize());
    }
}