sorting a queue

[plasticfood]

i am getting an error in this.
basically it sorts a queue in abc order.

public class Queue2{
	public static void main(String [] args){
	
		LinkedQueue q = new LinkedQueue();
		q.enqueue("d");
		q.enqueue("v");
		q.enqueue("b");
		q.enqueue("a");
		q.enqueue("d");
		
		System.out.println(q);
		System.out.println("----------------");
		
		sort(q);
	}
	
	public static void sort(LinkedQueue q){
		
		LinkedQueue qFinal = new LinkedQueue();
		int count = 0;
		String pivot = "";
		boolean sorted = false;
		int count3 = 0;
		
		while(sorted == false || ! q.empty()){
			pivot = q.dequeue();
			if(pivot.compareTo(q.peek()) > 0){
				q.enqueue(pivot);
				count3++;
			}
			else if(pivot.compareTo(q.peek()) < 0){
				qFinal.enqueue(pivot);
				count++;
				if(count == 4){
					qFinal.enqueue(q.peek());
		if(count3 == 0){
						System.out.println(qFinal);
						break;
					}
					else{
						sort(qFinal);
					}
				}
			
				
				}
				
		}
			
		
		
				
				
	}
}

public class LinkedQueue
{
    private class Node
    {
        String value;
        Node next;
        Node(String val, Node n)
        {
            value = val; 
            next = n;
        }       
    }

    private Node front = null; 
    private Node rear = null;                                     
   
    
    public void enqueue(String s)
    {
        if (rear != null)
        {
           rear.next = new Node(s, null);
           rear = rear.next;
        }
        else
        {
            rear = new Node(s, null);
            front = rear;
        }
    }

    public boolean empty()
    {
        return front == null;
    }
    
    public String peek()
    {
        if (empty())
            throw new IllegalArgumentException();
        else
            return front.value;        
    }
    
    public String dequeue()
    {
       if (empty()) 
           throw new IllegalArgumentException();
       else
       {
           String value = front.value;
           front = front.next;
           if (front == null) rear = null;    
           return value;
       }
    }
    
    
    public String toString()
    {
       StringBuilder sBuilder = new StringBuilder();
       
       // Walk down the list and append all values
       Node p = front;
       while (p != null)
       {
           sBuilder.append(p.value + " ");
           p = p.next;
       }
       return sBuilder.toString();        
    }
}