Gregorian Calendar "cal.add" Method Issues

Question

I am currently attempting to write a program which returns the date 100 days from the current date of today. Here's the code:

public class gregorianCalendar {
    public static void main(String[] args){
        Calendar cal = new GregorianCalendar();
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH);
        int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
        int weekday = cal.get(Calendar.DAY_OF_WEEK);

        cal.add(Calendar.DAY_OF_MONTH, 100);
        System.out.print("100 days from today, the date will be: " + month);
        System.out.print("/" + dayOfMonth);
        System.out.println("/" + year);
    }
}

The output of the code gives the current date rather than the date 100 days after the current date. Any help would be greatly appreciated.

Answer 1

public class gregorianCalendar {
    public static void main(String[] args){
        Calendar cal = new GregorianCalendar();
        cal.add(Calendar.DAY_OF_MONTH, 100); // <------- add should be here
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH);
        int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
        int weekday = cal.get(Calendar.DAY_OF_WEEK);

        System.out.print("100 days from today, the date will be: " + month);
        System.out.print("/" + dayOfMonth);
        System.out.println("/" + year);
    }
}

OR

public class gregorianCalendar {
    public static void main(String[] args){
        Calendar cal = new GregorianCalendar();
        // --------------- Current Date ------------
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH);
        int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
        int weekday = cal.get(Calendar.DAY_OF_WEEK);
        System.out.print("today, the date is: " + month);
        System.out.print("/" + dayOfMonth);
        System.out.println("/" + year);    


        // ---------- Current date + 100------------
        cal.add(Calendar.DAY_OF_MONTH, 100);
        System.out.print("100 days from today, the date will be: " + cal.get(Calendar.MONTH));
        System.out.print("/" + cal.get(Calendar.DAY_OF_WEEK));
        System.out.println("/" + cal.get(Calendar.YEAR));
    }
}