Created
October 18, 2014 03:21
-
-
Save alexandervasyuk/3f2514f4e65945a84996 to your computer and use it in GitHub Desktop.
remove element from double linked list
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
public class DoublyLinkedList { | |
Node head; | |
Node tail; | |
public Node getHead() { | |
return head; | |
} | |
public Node getTail() { | |
return tail; | |
} | |
public void append(int d) { | |
if (head == null) { | |
head = tail = new Node(d); | |
} else { | |
Node n = new Node(d); | |
tail.setNext(n); | |
n.setParent(tail); | |
tail = tail.getNext(); | |
} | |
} | |
public Node remove(int d) { | |
if (head == null) return null; | |
while (head != null && head.getData() == d) { | |
Node next = head.getNext(); | |
if (next != null) next.setParent(null); | |
head = next; | |
} | |
if (head != null) { | |
Node prev = head; | |
Node current = head.getNext(); | |
while (current != null) { | |
if (current.getData() == d) { | |
Node curNext = current.getNext(); | |
prev.setNext(curNext); | |
if (curNext != null) curNext.setParent(prev); | |
current = curNext; | |
} else { | |
prev = prev.getNext(); | |
current = current.getNext(); | |
} | |
} | |
} | |
return head; | |
} | |
public void print() { | |
while (head.getNext() != null) { | |
System.out.print(head.getData() + " -> "); | |
head = head.getNext(); | |
} | |
System.out.println(head.getData()); | |
} | |
} | |
public class Node { | |
private Node next; | |
private Node parent; | |
private Integer data; | |
public Node(int d) { | |
data = d; | |
} | |
public void setNext(Node n) { | |
next = n; | |
} | |
public Node getNext() { | |
return next; | |
} | |
public void setParent(Node n) { | |
parent = n; | |
} | |
public Node getParent() { | |
return parent; | |
} | |
public Integer getData() { | |
return data; | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment