Question

所以我已经坐在这里过去5个小时，试图了解我在做什么，我有一个简单的初学者任务，即创建多种不同的方法来找出存储为全局名称的用户名。变量，以及它们出生的月份以整数形式存储。一旦存储了整数，我就使用switch语句来对应某个月份，我认为到目前为止该月份还不错。但是，在我的主类中调用方法时，我始终为UsersName变量和monthString变量返回空值。

public class BirthMonthWithFunctions {

    public static String UsersName;

    public static void main(String[] args) {

        String monthString = null;
        BirthMonthWithFunctions bm = new BirthMonthWithFunctions();
        BirthMonthWithFunctions.getUsersName();
        bm.getUsersBirthMonthNumber();
        BirthMonthWithFunctions.computeBirthMonth(0);
        System.out.print(UsersName + "Was born in: " + monthString);

    }

    static void getUsersName() {
        String UsersName = JOptionPane.showInputDialog(null, "What is your name?");


    }

    public int getUsersBirthMonthNumber() {
        int BirthMonth = Integer.parseInt(JOptionPane.showInputDialog(null,"Which month were you born in as an integer between 1-12?"));

        return BirthMonth;
    }

    public static String computeBirthMonth(int BirthMonth) {

        int choice = BirthMonth;
        String monthString;
        switch(choice) {
            case 1: monthString = "January";
                    break;
            case 2: monthString = "February";
                    break;
            case 3: monthString = "March";
                    break;
            case 4: monthString = "April";
                    break;
            case 5: monthString = "May";
                    break;
            case 6: monthString = "June";
                    break;
            case 7: monthString = "July";
                    break;
            case 8: monthString = "August";
                    break;
            case 9: monthString = "September";
                    break;
            case 10: monthString = "October";
                    break;
            case 11: monthString = "November";
                    break;
            case 12: monthString = "December";
                    break;
            default: monthString = "Invalid Month";
                    break;

        }

        return monthString;

    }

}

Answer 1

请您尝试一下我编辑的这段代码。

public static void main(String[] args) {

    String monthString = null;
    BirthMonthWithFunctions bm = new BirthMonthWithFunctions();
    BirthMonthWithFunctions.getUsersName();
    int BirthMonth = bm.getUsersBirthMonthNumber();
    BirthMonthWithFunctions.computeBirthMonth(BirthMonth);
    System.out.print(UsersName + "Was born in: " + monthString);

}

static void getUsersName() {
    UsersName = JOptionPane.showInputDialog(null, "What is your name?");
}

还从以下方法中删除String变量声明：computeBirthMonth

应该是这样的：

public static String computeBirthMonth(int BirthMonth) {

    int choice = BirthMonth;
    switch(choice) {..............
    }

    return monthString;
}

调用我的方法时出现问题，有人可以提供一些输入吗？

1 个答案: