Could you check if right

        switch(day_of_week)
        {
         case Monday:
           System.out.println("today is monday");
           break;
...

public class Test
{
    public static void main(String[] args)
    {
        String[] day_names = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };
        int day = 1;
        System.out.println("Today is " + day_names[day-1]);
    }
}

public class Test
{
    enum DayOfWeek
    {
        Monday,
        Tuesday,
        Wednesday,
        Thursday,
        Friday,
        Saturday,
        Sunday,
    }

    public static void main(String[] args)
    {
        int day = 1;
        System.out.println("Today is " + DayOfWeek.values()[day-1]);
        // or if you can omit the usage of an int type then you can say:
        //DayOfWeek day = DayOfWeek.Monday;
        //System.out.println("Today is " + day);
    }
}

public class Test
{
    enum DayOfWeek
    {
        Monday(1),
        Tuesday(2),
        Wednesday(3),
        Thursday(4),
        Friday(5),
        Saturday(6),
        Sunday(7);

        public static DayOfWeek fromInt(int i)
        {
            assert i>=1 && i<=7;
            return values()[i-1];
        }

        private DayOfWeek(int customValue)
        {
            _customValue = customValue;
        }

        public int getCustomValue()
        {
            return _customValue;
        }

        // You can store any kind of custom info for each enum member, not only an integer.
        // For example some kind of textual description, or fancy name, or references to data objects.
        private int _customValue;
    }

    public static void main(String[] args)
    {
        int day = DayOfWeek.Monday.getCustomValue();
        System.out.println("Today is " + DayOfWeek.fromInt(day));

        /*
        // This is much more elegant if you don't have to use an int type:
        DayOfWeek day = DayOfWeek.Monday;
        System.out.println("Today is " + day);
        */
    }
}