Java-Masterclass-Udemy/13_NumberDaysInMonth.java at master · furkansimsekli/Java-Masterclass-Udemy · GitHub

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public class NumberOfDaysInMonth {

    public static boolean isLeapYear(int year){

        if(year < 1 || year > 9999)
            return false;

        if((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0))
            return true;

        else
            return false;
    }

    public static int getDaysInMonth(int month, int year){

        if(month < 1 || month > 12 || year < 1 || year > 9999)
            return -1;

        switch(month){

            case 1:
                return 31;

            case 2:
                if(isLeapYear(year) == true)
                    return 29;
                else
                    return 28;

            case 3:
                return 31;

            case 4:
                return 30;

            case 5:
                return 31;

            case 6:
                return 30;

            case 7:
                return 31;

            case 8:
                return 31;

            case 9:
                return 30;

            case 10:
                return 31;

            case 11:
                return 30;

            case 12:
                return 31;

            default:
                return -1;
        }
    }
}