java - 如果满足多个条件，如何使用 If 语句计算数字？

Question

我已经用我所做的更改编辑了下面的代码。这是我得到的输出。

请输入商品。进口香水瓶 请输入进口香水瓶价格:47.50 您想继续添加项目吗？ (Y 型)表示 Yes，(N 型)表示 No.n 您的购物车包含以下含税商品{进口盒巧克力=10.00，进口瓶香水=67.50} 67.50

一盒巧克力应该是10.50，进口瓶应该是54.65。我使用调试并发现我使用的总价格变量为 10.50，但看起来又变回来了。另外，不要读取具有

的循环

 if (item.contains("imported") && item.contains("bottle")) 

上面写着

 else if (item.contains("imported"))

首先。我的完整代码如下。

public class SalesTax 
{
public static void main(String[] args) 
{
    // Input items for shopping cart
    HashMap<String, String> cart = new HashMap<String, String>();
    HashMap<String, String> shoppingcart = new HashMap<String, String>();

    // Create a Scanner
    Scanner input = new Scanner(System.in);

    // variables
    char done;

    //boolean goods;
    double totalprice = 0.00;
    double taxprice;

    // Pick items for list.
    do 
    {  
        System.out.print("Please enter an item.");
        String item = input.nextLine();

        System.out.print("Please enter the price for "+ item + ": ");
        String price = input.nextLine(); 

        double price1 = Double.parseDouble(price);
        totalprice += price1; 

        //System.out.println(String.format("%.2f",totalprice));
        String price2 = String.valueOf(price1);
        cart.put(item, price2);

        //determine if item will have additional tax
        if (item.contains("music"))
        {
             price1 = Double.parseDouble(price);
            taxprice = price1 * .10;

            totalprice = (totalprice + taxprice);

            //System.out.println(String.format("%.2f",totalprice));
            String newprice2 = String.valueOf(String.format("%.2f", price1 * 1.10));
            shoppingcart.put(item,newprice2);
        }
        else if (item.contains("imported"))
        {
             price1 = Double.parseDouble(price);
            taxprice = price1 * .05;

            totalprice = (totalprice + taxprice);

            //System.out.println(String.format("%.2f",totalprice));
            String newprice2 = String.valueOf(String.format("%.2f", totalprice));
            shoppingcart.put(item,newprice2);
        }
        if (item.contains("imported") && item.contains("bottle"))
        {
             price1 = Double.parseDouble(price);
            taxprice = price1 * (.05 + .10);

            totalprice = (totalprice + taxprice);

            //System.out.println(String.format("%.2f",totalprice));
            String newprice2 = String.valueOf(String.format("%.2f", totalprice));
            shoppingcart.put(item,newprice2);
        }
        else if(item.contains("bottle"))
        {
             price1 = Double.parseDouble(price);
            taxprice = price1 * .10;

            totalprice = (price1 + taxprice);

            //System.out.println(String.format("%.2f",totalprice));
            String newprice2 = String.valueOf(String.format("%.2f", price1 * 1.10));
            shoppingcart.put(item,newprice2);
        }
        else 
        {
            shoppingcart.put(item, price);
        }


        System.out.print("Would you like to continue to add items? (Type Y) for Yes and (Type N) for No.");
        done = input.nextLine().charAt(0);
    } while(Character.toUpperCase(done) == 'Y');

   System.out.println("Your cart contains the following at items with tax" + shoppingcart); //+ String.format("%.2f", totalprice));
   System.out.println(String.format("%.2f",totalprice));
}

}

Answer 1

使用&&运算符。它称为逻辑 AND 运算符。

//if item contains both "imported" and "bottle"
if (item.contains("imported") && item.contains("bottle")){
    //code
}

Read more about operators here.