将字符串转换为枚举在Java中给出错误？

Question

All The Examples of String to Enum Convertion taking only one String But In my Example String like this...

String allDays="MONDAY,SUNDAY,FRIDAY";

and My Enum Class like this..

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;
    }
}

So in that Time WeedayType.valueOf(allDay) is giving error..... Any suggestions for this..

Answer 1

Try like this:

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

Answer 2

You will be getting the below error

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

The reason is you are passing the following String to your WeedayType enum, which is an illegal argument as the exception says.

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

The valid values you can pass to valueOf method are "MONDAY", "TUESDAY" etc.(ie your enum names). Other values gives you java.lang.IllegalArgumentException which is the correct behaviour.