java - Number Of Days in a month of particular year Not Working -

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note: donot mark duplicate, know duplicate question didn't it.

i want calculate number of days in month of particular year. read this , not working fine. tried following

public class numofdays {     public static void main(string[] args) {          scanner input = new scanner(system.in);         system.out.print("enter month: ");         int month = input.nextint();         system.out.print("enter year: ");         int year = input.nextint();          calendar mycal = new gregoriancalendar(year, month, 1);          system.out.println("number of days are: " + mycal.getactualmaximum(calendar.day_of_month));      } }

my console is

enter month: 2 enter year: 2000 number of days are: 31 /// wrong

and 

enter month: 10 enter year: 1999 number of days are: 30 // correct

i know there 1 other method i.e. calculate manually, want above. please let me know if doing wrong.

p.s: using java-8.

wasn't there 31 days in march 2000? month 0 based, doc (http://docs.oracle.com/javase/8/docs/api/java/util/gregoriancalendar.html#gregoriancalendar-int-int-int-)

edit: i'm stupid, thought had number of days in month figured out. need use getactualmaximum, not get. (http://docs.oracle.com/javase/8/docs/api/java/util/gregoriancalendar.html#getactualmaximum-int-)


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