Class Node

12_LinkedList.java/DLL.java:2–12

public class DLL {
    public static class Node {
        int data;
        Node next;
        Node prev;

        public Node(int data) {
            this.data = data;
            this.next = null;
            this.prev = null;
        }
    }

    public static Node head;
        public static Node tail;