Java Switch on Enum Value

Dev Step :

I want the user to enter a number from 1 to 7. If the number is 1, print that it is a Monday. If the number is 2, print that it is Tuesday, etc.

The following code compiles, but it is not logically correct.

Please see the comments for where assistance is required:

import java.util.Scanner;

public class Test {
    private enum Week {
        MONDAY("1"), TUESDAY("2"), WEDNESDAY("3"), 
        THURSDAY("4"), FRIDAY("5"), SATURDAY("6"), SUNDAY("7");
        private String value;

        private Week(String value) {
            this.value = value;
        }
    }

    public static void main(String[] args) {

        // How to instantiate this correctly, so that it doesn't only point to one value
        Week week = Week.MONDAY;
        System.out.print("Enter a number: ");
        Scanner input = new Scanner(System.in);
        String userInput = input.next();

        // The switch parameter is not correct. This is what needs to be fixed.
        // I want to use this case layout.
        //The enums each have a value. The user enters a value. I want to switch over userInput.
        switch (week) {
            case MONDAY: System.out.println("That's Monday"); break;
            case TUESDAY: System.out.println("That's Tuesday"); break;
            case WEDNESDAY: System.out.println("That's Wednesday"); break;
            case THURSDAY: System.out.println("That's Thursday"); break;
            case FRIDAY: System.out.println("That's Friday"); break;
            case SATURDAY: System.out.println("That's Saturday"); break;
            case SUNDAY: System.out.println("That's Sunday"); break;
            default: break;
        }
    }
}

Nicholas K :

You need to introduce a method to fetch the enum constant based on the value passed in :

public static Week fetchValue(String constant) {
    for (Week week : Week.values()) {
        if (week.value.equals(constant)) {
            return week;
        }
    }
    return null;
}

Now use it like :

Week weekday = Week.fetchValue(userInput);
if (weekday != null) {
   switch (week ) {

    // rest of the code

   }
} else {
   System.out.println("Incorrect input");
}