Print day of week for program when input is given?

Question

I am using switch case statements, I have to print day of the week after some given inputs in the format of year/month/day. Here is the class that is done so far and what I have done for the printDayOfWeek() method in the Date class:

class Date {

    int year, month, day;
    Date(int y, int m, int d) {
        year = y;
        month = m;
        day = d;
    }


    public int getDayOfWeek() {

        int y0 = year - (14 - month) / 12;
        int x = y0 + y0 / 4 - y0 / 100 + y0 / 400;
        int m0 = month + 12 * ((14 - month) / 12) - 2;
        int d0 = (day + x + (31 * m0) / 12) % 7;

        return d0;
    }

    public int getDaysInMonth(int month) {

        int daysInMonth = (int) (28 + (Math.floor(month / 8.0) + month) % 2 + 2 % month + 2 * Math.floor(1.0 / month));

        if (month == 2 && isLeapYear()) {
            daysInMonth += 1;
        }
        return daysInMonth;
    }


    public boolean isLeapYear() {


        boolean isLeapYear = true;

         if (year % 4 != 0) {
        isLeapYear = false;
    }
    else {  
        if (year % 100 != 0) {
            isLeapYear = true;
        }
        else if (year % 400 != 0) {
            isLeapYear = false;
        }
    else { 
            isLeapYear = true;
         }
    }
        // Task I.1

        return isLeapYear;
    }

    public void printDaysInMonth() {

        // Task I.2
    for (int i = 1; i <= 12; i++) {
        int m = getDaysInMonth(i);

        System.out.println( i + "         " + m);
    }
}

    public void printDaysInYear() {

        // Task II

    }

    public void printDayOfWeek() {

        // Task III
         int d0 = getDayOfWeek();

         switch(d0) {
             case 1:
                 System.out.println("Monday");
             case 2:
                 System.out.println("Tuesday");
             case 3:
                 System.out.println("Wednesday");
             case 4:
                 System.out.println("Thursday");
             case 5:
                 System.out.println("Friday");
             case 6:
                 System.out.println("Saturday");
             case 7:
                 System.out.println("Sunday");
         }

    }


}

What is wrong with my Prinddayofweek method? dont really know what to do at that point since am new to switch cases.

Answer 1

This is how your printDayOfWeek() function should look like:- as you are doing %7 Sundays will have value 0. In addition to that put break; at end of each sys out to stop the flow of execution.

public void printDayOfWeek() {

        // Task III
         int d0 = getDayOfWeek();

         switch(d0) {
             case 0:
                 System.out.println("Sunday");
                 break;
             case 1:
                 System.out.println("Monday");
                 break;
             case 2:
                 System.out.println("Tuesday");
                 break;
             case 3:
                 System.out.println("Wednesday");
                 break;
             case 4:
                 System.out.println("Thursday");
                 break;
             case 5:
                 System.out.println("Friday");
                 break;
             case 6:
                 System.out.println("Saturday");
                 break;
         }

    }