public class DoublyLinkedList extends LinkedList{

public void insertAtHead(int value){

Node newNode = new Node(value);

if(this.head == null){

this.head = newNode;

}

else{

newNode.next = this.head;

this.head.prev = newNode;

this.head = newNode;

}

}

public void insertAtPos(int k,int value){

Node newNode = new Node(value);

int cnt = 0;

Node temp = this.head;

while(temp != null){

if(cnt == k){

temp.prev.next = newNode;

newNode.next = temp;

newNode.prev = temp.prev;

temp.prev = newNode;

return;

}

temp = temp.next;

}

System.out.println("invalid position");

}

public void deleteValue(int value){

Node temp = this.head;

while(temp!= null){

if(temp.data == value){

temp.prev.next = temp.next;

temp.next.prev = temp.prev;

return;

}

}

}

}