java - 线程中的异常 "AWT-EventQueue-0"java.lang.NumberFormatException : For input string: "1 "

Question

我对 Java 编程非常陌生，我正在学习基于 Java 的类(class)。我目前正在做这个基于 boolean 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。如果有任何其他错误，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)

<小时/>

    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

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