我很難弄清楚如何使用 if/else 語句比較兩個價格以確定哪個價格較大，哪個價格較小。通過使用箭頭來表示它錯誤：double 不能取消引用就目前而言，每當我編譯我的代碼時，我都會收到此錯誤：public class MeetAdapter extends RecyclerView.Adapter<MeetAdapter.ProductViewHolder> {    private Context mCtx;    private List<Meet> meetList;    public MeetAdapter(Context mCtx, List<Meet> meetList) {        this.mCtx = mCtx;        this.meetList = meetList;    }    @Override    public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        LayoutInflater inflater = LayoutInflater.from(mCtx);        View view = inflater.inflate(R.layout.meat_list_row, null);        return new ProductViewHolder(view);    }    @Override    public void onBindViewHolder(ProductViewHolder holder, int position) {        Meet meet = meetList.get(position);        Picasso.with(mCtx)                .load(meet.getUrl_id())                .into(holder.imageViewM);        holder.textViewName.setText(meet.getName());        holder.newPrice.setText(String.valueOf(meet.getPrice()));        holder.old_price.setText(meet.getOld_price());        holder.textViewDate_id.setText(meet.getDate_id());    }    @Override    public int getItemCount() {        return meetList.size();    }    class ProductViewHolder extends RecyclerView.ViewHolder {        TextView textViewName, old_price, newPrice, textViewDate_id;        ImageView imageViewM, imageViewD;        public ProductViewHolder(View itemView) {            super(itemView);            textViewName = itemView.findViewById(R.id.meat_name);            //old_price = itemView.findViewById(R.id.meat_Direction);            newPrice = itemView.findViewById(R.id.meat_price);            textViewDate_id = itemView.findViewById(R.id.meat_date);            imageViewM = itemView.findViewById(R.id.image_meat);            }        }    }}錯誤