Question

其实我的java程序就像......

public class Schedule {
    public static enum RepeatType {
        DAILY, WEEKLY, MONTHLY;
    }

    public static 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 static List<Date> generateSchedule(RepeatType repeatType,List<WeekdayType> repeatDays) {
            // ...
            // here some logic i wrote
        }
    }
}

我将这个方法调用到我的Business类中，如下所示......

@RemotingInclude
public void createEvent(TimetableVO timetableVO) {
    if ("repeatDays".equals(timetableVO.getSearchKey())) {
        List<Date> repeatDaysList = Schedule.generateSchedule(timetableVO.getRepeatType() , timetableVO.getRepeatDays());
    }
}

最后TimetableVO是

@Entity
@Table(name="EC_TIMETABLE")
public class TimetableVO extends AbstractVO {
    // ...
    private RepeatType repeatType;

    // But in this case the method generateSchedule(-,-) was not calling.
    private List<WeekdayType> repeatDays;
    // ... 
}

所以我的问题是以下哪一个是更好的声明...

 private List<WeekdayType> repeatDays;

（或）

 // If we give like this `How to Convert Enum type to String` because generateSchedule() method taking enum type value....
 private String repeatDays;

Answer 1

每个枚举类型都内置了方法name()，以使枚举名称为String，valueOf(String)朝向另一个方向。这可能就是你要找的东西。

Answer 2

可以使用toString（）方法将任何枚举类型的值转换为String。您可能没有意识到（我之前没有）如果您声明RepeatType变量r1，那么可以使用{{r1将String转换为toString() 1}}方法EG r1.toString()

本计划：

public class Main {

    /** Creates a new instance of Main */
    public Main() {
    }

    public static enum RepeatType {
        DAILY, WEEKLY, MONTHLY;
    }    

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        RepeatType r1;
        r1 = RepeatType.DAILY;
        System.out.printf("R1 VALUE: %s\n", r1.toString());

        r1 = RepeatType.WEEKLY;
        System.out.printf("R1 VALUE: %s\n", r1.toString());

        r1 = RepeatType.MONTHLY;
        System.out.printf("R1 VALUE: %s\n", r1.toString());


    }

}

将输出实际的枚举值如下：

R1 VALUE: DAILY
R1 VALUE: WEEKLY
R1 VALUE: MONTHLY

Answer 3

最后我得到了正确答案，请使用以下内容..

    @Entity
@Table(name="EC_TIMETABLE")
public class TimetableVO extends AbstractVO {
    // ...
    private RepeatType repeatType;

    // But in this case the method generateSchedule(-,-) was not calling.
    private WeekdayType repeatDays;
    // ... 
}

在我的服务方法中，我将Enum（WeekdayType）转换为List，因此很容易......

    List<WeekdayType> weekdayList= new ArrayList<WeekdayType>();
    weekdayList.add(timetableVO.getRepeatDays());
List<Date> repeatDaysList = Schedule.generateSchedule(timetableVO.getRepeatType() , weekdayList);

是否可以将Enum值存储在String中？

3 个答案: