Take day of week from date

Question

I have problem with my program, in which I have to insert a random date (dd/MM/yyyy) and if the day is Friday or Saturday, it should print out "It's time for party". I insert dates with Friday or Satuday, but it still print's out "You should study". Can somebody help out?

Scanner scanner = new Scanner(System.in);
    String input = scanner.nextLine();
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
    LocalDate date = LocalDate.parse(input, formatter);
    System.out.println(date.getDayOfWeek().name());

    if (date.getDayOfWeek().equals("FRIDAY")) {
        System.out.println("Time for party, because it is: " + date.getDayOfWeek());
    }
    else if (date.getDayOfWeek().equals("SATURDAY"))
        System.out.println("Time for party, because it is: " + date.getDayOfWeek());
    else {
        System.out.println("You should study! It is: " + date.getDayOfWeek());
    }

Answer 1

LocalDate.getDayOfWeek returns an enum of type DayOfWeek . But you are comparing a String with the enum.

You must do

date.getDayOfWeek() == DayOfWeek.FRIDAY

Answer 2

You're comparing a DayOfWeek instance with a String instance so they will never be equal as they are different types.

one solution is to call toString prior to calling equals:

if (date.getDayOfWeek().toString().equals("FRIDAY")){...}

or better use:

if (date.getDayOfWeek() == DayOfWeek.FRIDAY) {...}

Answer 3

You should replace string value to enum type DayOfWeek.FRIDAY or DayOfWeek.SATURDAY . As you comparing string with enum.

if (date.getDayOfWeek().equals(DayOfWeek.FRIDAY)) {
                System.out.println("Time for party, because it is: " + date.getDayOfWeek());
            }
            else if (date.getDayOfWeek().equals(DayOfWeek.SATURDAY))
                System.out.println("Time for party, because it is: " + date.getDayOfWeek());
            else {
                System.out.println("You should study! It is: " + date.getDayOfWeek());
            }