java - 如何克服这种 java 语法，使 double 成为字符串？

Question

我陷入了我的 Bean 类 - CartItemBean 成双的情况。

    public double getTotalCost() {
    return dblTotalCost;

SetExpressCheckOutService 类要求我将金额放入字符串中。

    String amount = "";
    CartItemBean details = new CartItemBean();
    amount = details.getTotalCost();

        try {
        //calling the service, setting up the checkoutpage
        String token = setExpressCheckoutService.setExpressCheckout(userId, amount, 
        currencyCode, returnURL, cancelURL, paymentAction);
        log.info("Url to redirect to: https://www.sandbox.paypal.com               
        /webscr?cmd=_express-checkout&useraction=commit&token=" + token);
    } catch (PayPalException e) {

     // Log the exception

        log.log(Level.WARNING, "Paypal exception", e);

    }
     }

我希望有人能告诉我如何克服这样的问题。

谢谢。

Answer 1

使用Double对象的toString方法:

String string = Double.toString(double);

所以在你的代码中这样做:

String token = setExpressCheckoutService.setExpressCheckout(userId, Double.toString(amount), currencyCode, returnURL, cancelURL, paymentAction);