Circular Doubly-linked list: Cannot seem to get this working. Please help!

Question

Hello, I am trying to implement a CDLL of Node objects that look like: (null/char/char/null);
here are my Node and List (called cipher) constructors & insert() method:
Node constructors:
     //     Default constructor
     //     -Takes no args
     //     -Assigns plaintext val to ''
     //     -Assigns cipher val to ''
     //     -Assigns left & right pointers to null
     public Node() {
          previous = null;
          plaintext = ' ';
          ciphertext = ' ';
          next = null;
     }//end default constructor
     //      Constructor 2
     //     -Assigns left & right pointers to null
     //     -Parameter: char newPlaintext: the plaintext value to be assigned to the Node
     //     -Parameter: char newCipher: the cipher value to be assigned to the Node
     public Node(char newPlaintext, char newCipher) {
          previous = null;
          plaintext = newPlaintext;
          ciphertext = newCipher;
          next = null;
     }//end constructor 2List Constructor:
     public Cipher() {
          //Create the Node coder with empty elements that points to itself
          sentinel = new Node(' ', ' ');
          //coder points to itself in both directions
          sentinel.setNext(sentinel.previous);
          sentinel.setPrevious(sentinel.next);
          //Set pointer to the node created
          current = sentinel;
     }//end Cipher() defalut constructorinsert() method:
public static void insert(char thePlaintext, char theCiphertext) {
          Node temp = new Node(thePlaintext, theCiphertext);
          if (isEmpty()) {
               System.out.println("          in the isEmpty area of insert");
               current = temp;    
               sentinel = temp;
          }else {
               System.out.println("          in the not empty area of insert");
               Node p = current.getNext();
               current.setNext(temp);
               temp.setPrevious(current);
               temp.setNext(p);
               p.setPrevious(temp);
               p = current.getNext();
               current = temp; //Set last pointer to point to x
               System.out.println("Current.plaintext is: "+current.plaintext);     
               System.out.println("p.plaintext is: "+p.plaintext);     
               current = temp; //Set last pointer to point to x
          }//end ifI'm thinking that the problem is something relatively simple... I just can't seem to get it right.
Can somebody please tell me what's wrong w/ this data structure?
Thanks in advance to everyone.

Answer 1

Hello there, BrenFire.
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