I need to print a calendar of a given input from the command line. The main problem I am having is trying to print the actual body of the calendar. I have a method:
printMonth();
that is used to print the calendar. The method is void and non-static. However, when I call the method from main (static), there is no output.
Here is my code so far:
class MyDate {
private int day;
private int month;
private int year;
public MyDate(int theDay, int theMonth, int theYear){
theDay = day;
theMonth = month;
theYear = year;
}
public MyDate(){
}
public int getDay() {
return day;
}
public int getMonth() {
return month;
}
public String nameOfMonth() {
switch (month) {
case 1:
return "January";
case 2:
return "February";
case 3:
return "March";
case 4:
return "April";
case 5:
return "May";
case 6:
return "June";
case 7:
return "July";
case 8:
return "August";
case 9:
return "September";
case 10:
return "October";
case 11:
return "November";
case 12:
return "December";
// for any number less than 1 and greater than 12 throw an exception
default:
throw new RuntimeException("Invalid month number");
}
}
public int getYear() {
return year;
}
public String getDate(String[] datePartsObj) {
day = Integer.parseInt(datePartsObj[0]);
month = Integer.parseInt(datePartsObj[1]);
year = Integer.parseInt(datePartsObj[2]);
return day + "/" + month + "/" + year ;
}
public int getStartDay(int theYear, int theMonth) {
year = theYear;
month = theMonth;
// Get total number of days since 1/1/1800
int startDay1800 = 3;
int totalNumberOfDays = getTotalNumberOfDays(theYear, theMonth);
// Return the start day
return (totalNumberOfDays + startDay1800) % 7;
}
public int getTotalNumberOfDays(int theYear, int theMonth) {
year = theYear;
month = theMonth;
int total = 0;
// Get the total days from 1800 to year - 1
for (int i = 1800; i < theYear; i++)
if (isLeapYear(i))
total = total + 366;
else
total = total + 365;
// Adding days from January to the month prior to the calendar month
for (int i = 1; i < theMonth; i++)
total = total + getNumberOfDaysInMonth(theYear, i);
return total;
}
public int getNumberOfDaysInMonth(int theMonth, int theYear) {
month = theMonth;
year = theYear;
if (theMonth == 1 || theMonth == 3 || theMonth == 5 || theMonth == 7 ||
theMonth == 8 || theMonth == 10 || theMonth == 12)
return 31;
if (theMonth == 4 || theMonth == 6 || theMonth == 9 || theMonth == 11)
return 30;
if (theMonth == 2) return isLeapYear(theYear) ? 29 : 28;
return 0; // If month is incorrect
}
public boolean isLeapYear(int theYear) {
year = theYear;
if ((theYear % 4 == 0) && (theYear % 100 != 0)) return true;
if (theYear % 400 == 0) return true;
return false;
}
}
public class MyCalendar {
private static MyDate myDateObj;
public enum WeekDay{
Monday,
Tuesday,
Wednesday,
Thursday,
Friday,
Saturday,
Sunday;
}
public MyCalendar(MyDate newdate){
}
public MyCalendar(){
}
public int weekOfMonth() {
return;
}
public void printMonth() {
int theYear = myDateObj.getYear();
int theMonth = myDateObj.getMonth();
// Get start day of the week for the first date in the month
int startDay = myDateObj.getStartDay(theYear, theMonth);
// Get number of days in the month
int numberOfDaysInMonth = myDateObj.getNumberOfDaysInMonth(theYear, theMonth);
// Pad space before the first day of the month
int i = 0;
for (i = 0; i < startDay; i++)
System.out.print(" ");
for (i = 1; i <= numberOfDaysInMonth; i++) {
if (i < 10)
System.out.print(" " + i);
else
System.out.print(" " + i);
if ((i + startDay) % 7 == 0)
System.out.println();
}
System.out.println();
}
public static void main(String [] args) {
String[] datePartsObj;
datePartsObj = args[0].split("/");
int day = Integer.parseInt(datePartsObj[0]);
int month = Integer.parseInt(datePartsObj[1]);
int year = Integer.parseInt(datePartsObj[2]);
myDateObj = new MyDate(day, month, year);
MyCalendar myCalendar = new MyCalendar();
System.out.println(myDateObj.getDate(datePartsObj) + " is a " + " and locates in the " + myDateObj.nameOfMonth());
myDateObj.nameOfMonth();
System.out.println("The calendar of " + myDateObj.nameOfMonth() + " " + myDateObj.getYear() + " is: ");
System.out.println();
System.out.println(" Sun Mon Tue Wed Thu Fri Sat");
myCalendar.printMonth();
}
}
I am quite new to java, so any assistance with this problem would be greatly appreciated!
In your method printMonth() you have called method getNumberOfDaysInMonth(theMonth, theYear) and you have passed arguments in wrong order
change this line:
int numberOfDaysInMonth = myDateObj.getNumberOfDaysInMonth(theYear, theMonth);
to this one:
int numberOfDaysInMonth = myDateObj.getNumberOfDaysInMonth(theMonth, theYear);