线程“AWT-EventQueue-0”java.lang.NumberFormatException 中出现异常：对于输入字符串：“1”

Question

我对 Java 编程非常陌生，我正在上一门基于 Java 的课程。我目前正在做这个基于布尔值和RadioButtons 的咖啡项目。我相信我几乎已经完成了，除了我在控制台上收到此错误消息。如果还有其他错误，请告诉我，以便我修复！

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "1 "
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)

---

    public void purchase()
    {
        //local variables
        String  quantityString, buttonString, nameString, coffeeType;

        float subTotalFloat, priceFloat, taxFloat, grandTotalFloat;
        int quantityInteger;

        //Format the values to currency format
        DecimalFormat valueDecimalFormat = new DecimalFormat("$#0.00");

        //retrieve the input from the  user
        nameString = nameTextField.getText();
        quantityString = quantityTextField.getText();
        buttonString = coffeeType ();

        //change data types
        quantityInteger = Integer.parseInt(quantityString);
        ...
    }

Answer 1

更改Integer.parseInt(quantityString);为Integer.parseInt(quantityString.trim());，您的代码将正常工作！