Need help with Enum

Hi I'm new around and I'm actually doing a java homework right now, it asks me to write an application that contains an enumeration that represents the days of week.
My first objective in the program is to display a list of the days,
Then I am suppose to prompt the user for a day,
And finally display the hours of the chosen day.

I'm not really sure what to do here since I am getting an error compiling this

Code:

---

import java.util.Scanner;
public class DayOfWeek
{
        enum Days {MON, TUE, WED, THU, FRI, SAT, SUN}
       
        public static void main(String[] args)
        {
                String entry;
                Scanner scan = new Scanner(System.in);
               
                System.out.println("Enter a day: ");
                entry = scan.nextLine();               
                switch(entry)
                {
                        case MON:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case TUE:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case WED:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case THU:
                                System.out.println("Business hour from 9 to 9");
                                break;                               
                        case FRI:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case SAT:
                                System.out.println("Business hour from 9 to 6");
                                break;
                        case SUN:
                                System.out.println("Business hour from 11 to 5");
                                break;
                        default:
                                System.out.println("No such day exist!");
                }
               
        }
}

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Quote:

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I am getting an error compiling this

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And would you like to share the details of the error, or are we playing guessing games here?

db

Nevertheless, a hint for you: what does Scanner#nextLine() return?

db

Oh sorry here is the error:

Code:

---

DayOfWeek.java:21: error: cannot find symbol
                        case MON:
                            ^
  symbol:  variable MON
  location: class DayOfWeek
DayOfWeek.java:24: error: cannot find symbol
                        case TUE:
                            ^
  symbol:  variable TUE
  location: class DayOfWeek
DayOfWeek.java:27: error: cannot find symbol
                        case WED:
                            ^
  symbol:  variable WED
  location: class DayOfWeek
DayOfWeek.java:30: error: cannot find symbol
                        case THU:
                            ^
  symbol:  variable THU
  location: class DayOfWeek
DayOfWeek.java:33: error: cannot find symbol
                        case FRI:
                            ^
  symbol:  variable FRI
  location: class DayOfWeek
DayOfWeek.java:36: error: cannot find symbol
                        case SAT:
                            ^
  symbol:  variable SAT
  location: class DayOfWeek
DayOfWeek.java:39: error: cannot find symbol
                        case SUN:
                            ^
  symbol:  variable SUN
  location: class DayOfWeek
7 errors

 ----jGRASP wedge2: exit code for process is 1.
 ----jGRASP: operation complete.

---

As Darryl states, what does Scanner#nextLine() return? You're trying to compare this with your Days enum, and that won't work. You can only compare apples to apples and oranges to oranges.

Oh okay my scanner was scanning for string, and i did it as:
String entry;
when I should have declared it as:
Days entry;

I got it to work now thanks for the hint :D
Corrected code:

Code:

---

import java.util.Scanner;
public class DayOfWeek
{
        enum Days {MON, TUE, WED, THU, FRI, SAT, SUN}
       
        public static void main(String[] args)
        {
                Days entry;
                Scanner scan = new Scanner(System.in);
               
                System.out.println("Enter a day: ");
                entry = Days.valueOf(scan.nextLine());               
                switch(entry)
                {
                        case MON:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case TUE:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case WED:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case THU:
                                System.out.println("Business hour from 9 to 9");
                                break;                               
                        case FRI:
                                System.out.println("Business hour from 9 to 9");
                                break;
                        case SAT:
                                System.out.println("Business hour from 9 to 6");
                                break;
                        case SUN:
                                System.out.println("Business hour from 11 to 5");       
                }
               
        }
}

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Glad you've got it working.

You might consider showing the the options to the user before they enter it so they don't enter a wrong String.
Even better is to catch errors before they mess up your program. Consider calling the Days.valueOf(...) in a try/catch block where you catch an IllegalArgumentException.

Code:

---

        switch(entry)
        {
            case MON:
            case TUE:
            case WED:
            case THU:
            case FRI:
                System.out.println("Business hour from 9 to 9");
                break;
            case SAT:
                System.out.println("Business hour from 9 to 6");
                break;
            case SUN:
                System.out.println("Business hour from 11 to 5"); 
        }

---

db

Quote:

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Originally Posted by Fubarable

Glad you've got it working.

You might consider showing the the options to the user before they enter it so they don't enter a wrong String.
Even better is to catch errors before they mess up your program. Consider calling the Days.valueOf(...) in a try/catch block where you catch an IllegalArgumentException.

---

I have't learn that in class yet and i fixed it so my final version is like this:

Code:

---

import java.util.Scanner;
public class DayOfWeek
{
        enum Days {MON, TUE, WED, THU, FRI, SAT, SUN}
       
        public static void main(String[] args)
        {
                Days day;
                String[] days = new String[7];
                days[0] = "MON";
                days[1] = "TUE";
                days[2] = "WED";
                days[3] = "THU";
                days[4] = "FRI";
                days[5] = "SAT";
                days[6] = "SUN";
                Scanner scan = new Scanner(System.in);
               
                for(int i=0;i<days.length;i++)
                {
                        System.out.println(days[i]);
                }
                System.out.println();
                System.out.println("Enter a day: ");
                day = Days.valueOf(scan.nextLine());               
                switch(day)
                {
                          case MON:
                          case TUE:
                          case WED:
                        case THU:
                            case FRI:
                                    System.out.println("Business hour from 9 to 9");
                            break;
                            case SAT:
                            System.out.println("Business hour from 9 to 6");
                            break;
                            case SUN:
                            System.out.println("Business hour from 11 to 5"); 
                }               
        }
}

---

output came out like this:

Quote:

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----jGRASP exec: java DayOfWeek

MON
TUE
WED
THU
FRI
SAT
SUN

Enter a day:
SAT
Business hour from 9 to 6

----jGRASP: operation complete.

---