Number of leaves in Binary Tree

public static int numberOfLeavesInBT(BinaryTreeNode root){
        if(root == null)
            return 0;
        Queue queue = new LinkedList();
        queue.add(root);
        int count =0;
        while(!queue.isEmpty()){
            BinaryTreeNode node = queue.poll();
            if(node.getRight() == null&& node.getLeft() ==null)
                count++;
            if(node.getLeft() !=null)
                queue.add(node.getLeft());
            if(node.getRight() !=null)
                queue.add(node.getRight());
        }
        return count;
    }