Note

package Week1;

import java.util.Scanner;

public class Week1Assignment {
    public static void main(String[] args) {
        // Test code
        Scanner keyboard = new Scanner(System.in);

        System.out.print("Enter your Month by Number");

        int userMonth = keyboard.nextInt();

        System.out.print("Enter your Year by Number");

        int userYear = keyboard.nextInt();

        int userDay = getNumberOfDays(userMonth, userYear);

    }
}

public class MonthDays {
    private int January = 1;
    private int Feburary = 2;
    private int March = 3;
    private int April = 4;
    private int May = 5;
    private int June = 6;
    private int July = 7;
    private int August = 8;
    private int September = 9;
    private int October = 10;
    private int November = 11;
    private int December = 12;
    private int theYear = 2020;
    private int theDays = 1;

    /**
     * @param theMonth represent Month of the years
     * @param theYear  represen the Years
     * @param theDyas  return the Days of the
     */
    public int getNumberOfDays(int theMonth, int theYear) {

        if (theMonth <= 0) {
            throw new IllegalArgumentException("Month cannot be less than zero!");
        }
        if (theMonth >= 13) {
            throw new IllegalArgumentException("Month cannot be larger than thirteen");
        }
        if (theMonth == January || theMonth == March || theMonth == May || theMonth == July || theMonth == August
                || theMonth == October || theMonth == December) {
            return theDays = 31;
        } else if (theMonth == April || theMonth == June || theMonth == September || theMonth == November) {
            return theDays = 30;
        }
        // From here check it is leap year or not

        else if ((theYear % 400) == 0) {
            //it is leap year
            theDays = 29;
        } else if ((theYear % 100) == 0) {
            // It is not leap year;
            theDays = 28;
        } else if ((theYear % 4) == 0) {
            // It is leap year
            theDays = 29;
        } else {
            // It is not leap year
            theDays = 28;
        }

        return theDays;

    }
}

/*
 * public static int MonthDays(int theYear, int theMonth) {
 *
 * int theDays = 1; if (theMonth <= 0 ){ throw new
 * IllegalArgumentException("Month cannot be less than zero!"); } if (theMonth
 * >= 13){ throw new
 * IllegalArgumentException("Month cannot be larger than thirteen"); } if
 * (theMonth == 1 || theMonth == 3 || theMonth == 5 || theMonth == 7 || theMonth
 * == 8 || theMonth == 10 || theMonth == 12){ theDays = 31; } else if (theMonth
 * == 4 || theMonth == 6 || theMonth == 9 || theMonth == 11){ theDays = 30; }
 * //Feburary else if((theYear % 400) == 0){ //If it is leap year theDays = 29;
 * } else if((theYear % 100) == 0){ //It is not leap year; theDays = 28; } else
 * if((theYear % 4) == 0){ //It is leap year theDays = 29; } else { //It is not
 * leap year theDays = 28; }
 *
 * return theDays; }
 *
 */