调用方法后的Java反射，该方法未引发异常

因此，我创建了一个InvalidInputExeption异常类，如果没有有效的输入，它会在setter方法中用于引发异常。

public class kalsi.ContestantInformation {

    public void setFirstName(String firstName) throws InvalidInputExeption {
        checkInput(firstName, "Please only enter letter in the first name");
        this.firstName = firstName.replaceAll("\\s", "").toLowerCase();
    }

    public void setLastName(String lastName) throws InvalidInputExeption {
        checkInput(lastName, "Please only enter letter in the last name");
        this.lastName = lastName.replaceAll("\\s", "").toLowerCase();
    }

    public void setStreetNumber(String streetNumber) throws InvalidInputExeption {
        checkInput(streetNumber, "Please only enter numbers in the street number");
        this.streetNumber = streetNumber.replaceAll("\\s", "").toLowerCase();
    }

    public void setStreetName(String streetName) throws InvalidInputExeption {
        checkInput(streetName, "Please only enter letter in the street name name");
        this.streetName = streetName.replaceAll("\\s", "").toLowerCase();
    }

    public void checkInput(String s, String message) throws InvalidInputExeption {
        char[] array = s.toCharArray();
        for (char c : array) {
            if (!Character.isLetter(c)) {
                throw new InvalidInputExeption(message);
            }
        }

    }

    public void checkInput(int i, String message) throws InvalidInputExeption {
        String s = i + "";
        char[] array = s.toCharArray();
        for (char c : array) {
            if (!Character.isDigit(c)) {
                throw new InvalidInputExeption(message);
            }
        }
    }
}

这是我调用setFirstNameusing反射的主要方法。注意setFirstName不是唯一的setter方法。所有其他方法都在一个字符串数组中，这些字符串的名称为setMethods。

public static void main(String[] args)
        throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException,
        SecurityException, ClassNotFoundException, InstantiationException {
    ContestantInformation contestant1 = new ContestantInformation();
    String[] questions = { "What is your first name", "What is your last name", "What is your Street Name",
            "What is your Sreet Number" };
    String[] methods = { "setFirstName", "setLastName", "setStreetName", "setStreetNumber" };
    for (int i = 0; i < methods.length; i++) {
        do {
            try {
                flag = false;
                System.out.println(questions[i]);
                String scannerInput = scanner.nextLine();
                classContestantInfo.getDeclaredMethod(methods[i], stringParameter).invoke(contestant1,
                        scannerInput);
            } catch (InvocationTargetException e) {
                if (e.getCause() instanceof InvalidInputExeption) {
                    System.out.println(e.getMessage());
                }
            }
        } while (flag);
    }
}

问题是，当我输入不是字符串的内容时，它不会再提出问题，也不会给出错误消息，这里是输出。

What is your first name 9 null What is your last name

它会输出null并移至下一个问题，即使该问题应输出“请只输入名字中的字母”，然后再次要求用户输入。

如果有人要克隆代码，则以下是git clone URL：程序是ICS4U存储库中的RealityShowApplication：

https://github.com/simar1998/ICS4U.git