Question

String to Enum转换的所有示例只占用一个字符串但在我的示例字符串中就像这样......

String allDays="MONDAY,SUNDAY,FRIDAY";

和My Enum Class就是这样..

public enum WeekdayType {

    MONDAY(Calendar.MONDAY), TUESDAY(Calendar.TUESDAY), WEDNESDAY(
            Calendar.WEDNESDAY), THURSDAY(Calendar.THURSDAY), FRIDAY(
            Calendar.FRIDAY), SATURDAY(Calendar.SATURDAY), SUNDAY(
            Calendar.SUNDAY);

    private int day;

    private WeekdayType(int day) {
        this.day = day;
    }

    public int getDay() {
        return day;
    }
}

所以在那个时间WeedayType.valueOf(allDay)给出错误..... 对此有任何建议..

Answer 1

试试这样：

String allDays = "MONDAY,SUNDAY,FRIDAY";
        for (String day : allDays.split(",")) {
            System.out.println(WeekdayType.valueOf(day));
        }

Answer 2

您将收到以下错误

java.lang.IllegalArgumentException: No enum const class com.java.core.Test$WeekdayType.MONDAY,SUNDAY,FRIDAY

原因是您将以下字符串传递给 WeedayType 枚举，这是一个非法参数，如异常所示。

String allDays = "MONDAY,SUNDAY,FRIDAY"; 
WeedayType.valueOf(allDay);

您可以传递给valueOf方法的有效值是“MONDAY”，“TUESDAY”等（即您的枚举名称）。其他值为您提供java.lang.IllegalArgumentException，这是正确的行为。

将String转换为Enum会在java中出错吗？

2 个答案: