A linked list class implemented in Java

LinkedList.java

/*============================================================================
Name        : LinkedList.java
Author      : Eric Swanson
Date		: Sep 7, 2011
Version     : 
Description : 

Copyright (C) 2011 Eric Swanson

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
============================================================================*/

class LinkedList
{
	//Class variables for the Linked List
	private static Node head;
	private static int numNodes;
	
	public LinkedList(Object dat)
	{
		head = new Node(dat);
	}
	
	public void addAtHead(Object dat)
	{
		Node temp = head;
		head = new Node(dat);
		head.next = temp;
		numNodes++;
	}
	
	public void addAtTail(Object dat)
	{
		Node temp = head;
		while(temp.next != null)
		{
			temp = temp.next;
		}
		
		temp.next = new Node(dat);
		numNodes++;
	}
	
	public void addAtIndex(int index, Object dat)
	{
		Node temp = head;
		Node holder;
		for(int i=0; i < index-1 && temp.next != null; i++)
		{
			temp = temp.next;
		}
		holder = temp.next;
		temp.next = new Node(dat);
		temp.next.next = holder;
		numNodes++;
	}
	
	public void addAtIndex(int index, Node node)
	{
		Node temp = head;
		Node holder;
		for(int i=0; i < index-1 && temp.next != null; i++)
		{
			temp = temp.next;
		}
		holder = temp.next;
		temp.next = node;
		temp.next.next = holder;
		numNodes++;
	}
	
	public void deleteAtIndex(int index)
	{
		Node temp = head;
		for(int i=0; i< index - 1 && temp.next != null; i++)
		{
			temp = temp.next;
		}
		temp.next = temp.next.next;
		numNodes--;
	}
	
	public void switchWithNext(int index)
	{
		if(index != 0)
		{
			Node bOne = find(index - 1);
			Node one = find(index);
			Node two = one.next;
			
			one.next = two.next;
			bOne.next = two;
			two.next = one;
		}
		else
		{
			Node one = find(index);
			Node two = one.next;
			
			head = two;
			one.next = two.next;
			two.next = one;
		}
	}	
	
	public static int find(Node n)
	{
		Node t = head;
		int index = 0;
		while(t != n)
		{
			index++;
			t = t.next;
		}
		return index;
	}
	
	public static Node find(int index)
	{
		Node temp=head;
		for(int i=0; i<index; i++)
		{
			temp = temp.next;
		}
		return temp;
	}
		
	public static void printList()
	{
		Node temp = head;
		while(temp != null)
		{
			System.out.print(temp.data + ",");
			temp = temp.next;
		}
		System.out.print("\n");
	}
	
	public static int getSize()
	{
		return numNodes;
	}
	
	class Node
	{
		//Declare class variables
		private Node next;
		private Object data;
		
		public Node(Object dat)
		{
			data = dat;
		}
		
		public Object getData()
		{
			return data;
		}
	}
}

Line 98 Perhaps there is a mistake

--- Node bOne = find(index - 1);

Thank you @ericrswanny