Looping through enum values in a java code

Question

I receive a few compiling errors when I try to loop through an enum items by a regular for loop, could anyone help me to solve the problem?

public class WeeklySales
{
 public enum weekDays {Monday, Tuesday, Wednesday, Thursday, Friday};
 static Scanner sc = new Scanner(System.in);

 public static void main(String[] args)
{  
 double[] sales = new double[5];
 double total = 0;
 weekDays day;      

 for(day = weekDays.Monday; day <= weekDays.Friday; day = (weekDays)(day + 1))
  {
    System.out.println("Enter the sales amount for " + day + ":");
    sales[day] = sc.nextDouble();
  }

 for(day = weekDays.Monday; day <= weekDays.Friday; day = (weekDays)(day +1))
    total += sales[day];

 System.out.println("The total sales for Monday to Friday is: " + total);
}
}

for(day = weekDays.Monday; day <= weekDays.Friday; day = (weekDays)(day + 1)) ... can you explain why you think that this should work? Have you tried to search for working ways to iterate over an enum? sales[day] can you explain why you think that an enum value would be a suitable index for an array? — Tom
– Tom, Commented Jan 31, 2016 at 5:34
It seems that you mistakenly believe that enums are numbers. They are not, they are object instances. The enums are however numbered by order of definition, accessible through the ordinal() method. — Andreas
– Andreas, Commented Jan 31, 2016 at 6:03
Thank you all guys for your time, here are the error lists: error: bad operand types for binary operator '<=' for(day = weekDays.Monday; day <= weekDays.Friday; day = (weekDays)(day + 1)) ^ — Arash Mahmoudi
– Arash Mahmoudi, Commented Feb 4, 2016 at 3:03
Why I do think this should work? because this code snippet worked in C++ (an exercise in our C++ class) , and when I asked my teacher about java he said it will work in java in the same manner just change the syntax and do the proper casting but It did NOT work, and some how he refused to give me a solution, and i asked for help in this site. — Arash Mahmoudi
– Arash Mahmoudi, Commented Feb 4, 2016 at 3:17

markspace · Accepted Answer · 2016-01-31 05:37:32Z

2

From the Java tutorial:

for (weekDays day : weekDays.values()) {
    System.out.println("Enter the sales amount for " + day + ":");
    sales[day.ordinal()] = sc.nextDouble();
}

answered Jan 31, 2016 at 5:37

markspace

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Comments

mxuanlin · Accepted Answer · 2016-01-31 08:13:21Z

0

The following code works in my computers.

public class WeeklySales
{
    public enum weekDays {Monday, Tuesday, Wednesday, Thursday, Friday};
    static Scanner sc = new Scanner(System.in);

    public static void main(String[] args)
    {
        double[] sales = new double[5];
        double total = 0;
        for (weekDays day : weekDays.values()) {
            System.out.println("Enter the sales amount for " + day + ":");
            sales[day.ordinal()] = sc.nextDouble();
            total += sales[day.ordinal()];
        }
        System.out.println("The total sales for Monday to Friday is: " + total);
    }
}

answered Jan 31, 2016 at 8:13

mxuanlin

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2 Comments

Arash Mahmoudi Over a year ago

Thank you LinXuan, I really appreciate your help , and it worked in my computer too!!

mxuanlin Over a year ago

My pleasure~ @ArashMahmoudi

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