Need help with Enum

[ExX]

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

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!");
		}
		
	}
}

[DarrylBurke]

I am getting an error compiling this

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

db

[DarrylBurke]

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

db

[ExX]

Oh sorry here is the error:

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.

[Fubarable]

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.

[ExX]

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:

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");	
		}
		
	}
}

[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.

[DarrylBurke]

        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

[ExX]

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:

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:

----jGRASP exec: java DayOfWeek

MON
TUE
WED
THU
FRI
SAT
SUN

Enter a day:
SAT
Business hour from 9 to 6

----jGRASP: operation complete.