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。我目前正在做这个咖啡项目，它是基于布尔和RadioButtons的。我相信我几乎完成了它，除了我得到这个错误消息在控制台。如果有任何其他错误，请让我知道，以便我可以修复它！

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

将integer.parseInt(quantityString)；更改为integer.parseInt(quantityString.trim())；，您的代码就可以正常工作了！