计算总价 商品总数 以及BigDecimal转int

intgoodsCount=0;    double goodsAmount=0;    for(int i=0;i<cartList.size();i++){    goodsCount=goodsCount+cartList.get(i).getInt("number");    BigDecimal price= (BigDecimal) cartList.get(i).get("market_price");    goodsAmount=goodsAmount+price.doubleValue()*cartList.get(i).getInt("number");    }    System.out.println(goodsCount);    cartTotal.put("goodsAmount", goodsAmount);    cartTotal.put("goodsCount", goodsCount);