void LevelOrder(Node root)

{
     java.util.LinkedList<Node> q = new java.util.LinkedList<Node>();
    if(root!=null)
        q.add(root);
    while(q.peekFirst() != null ){
        Node current = q.poll();
        System.out.print(current.data + " ");
        if(current.left!=null)
            q.add(current.left);
        if(current.right!=null)
            q.add(current.right);    
    }