How to perform a circular split of a linked list

public class Main{
    static class Node{
        int data;
        Node next;
        public Node(int data) {
            this.data = data;
            this.next = null;
        }
    }
    static class CircularLinkedList{
        Node head, firstPartHead, secondPartHead;
        public CircularLinkedList() {
            this.head = null;
        }
        public void addFront(int data){
            Node node = new Node(data);
            if(head == null){
                head = node;
                node.next = head;
                return;
            }
            Node temp = head;
            while(temp.next != head)
                temp = temp.next;
            node.next = head;
            temp.next = node;
        }
        public void displaySubList(Node thead){
            Node temp = thead;
            do {
                System.out.print(temp.data + " - ");
                temp = temp.next;
            } while(temp != thead);
            System.out.println(thead.data);
        }
        public void displayList(){
            displaySubList(head);
        }
        public void splitList(){
            Node slow = head;
            Node fast = head;
            if (head == null) {
                return;
            }
            while (fast.next != head
                    && fast.next.next != head) {
                fast = fast.next.next;
                slow = slow.next;
            }
            if (fast.next.next == head) {
                fast = fast.next;
            }
            firstPartHead = head;
            if (head.next != head) {
                secondPartHead = slow.next;
            }
            fast.next = slow.next;
            slow.next = head;
        }
    }
    public static void main(String[] args) {
        CircularLinkedList cll = new CircularLinkedList();
        cll.addFront(5);
        cll.addFront(4);
        cll.addFront(3);
        cll.addFront(2);
        cll.addFront(1);
        System.out.println("Original list - ");
        cll.displayList();
        Node head1 = null, head2 = null;
        cll.splitList();
        System.out.println("First half - ");
        cll.displaySubList(cll.firstPartHead);
        System.out.println("Second half - ");
        cll.displaySubList(cll.secondPartHead);
    }
}