date is not working properly

Following is the code for adding date

public boolean addDate(int iDate)
{

Calendar cal = Calendar.getInstance();

cal.set(2009,02,01);
cal.add(Calendar.DATE, iDate); // Add days in Dates in Calendar


System.out.println("Date :"+cal.get(Calendar.DATE));
System.out.println("Month :"+cal.get(Calendar.MONTH));
System.out.println("Year :"+cal.get(Calendar.YEAR));

return true;
}

calling the function.
addDate(30);

But the output is giving wrongly, previously for couple of months it was working fine, but now I don't understand why the date function is throwing wrong error
Date :31
Month :2
Year :2009


I don't understand what to do!

Month is a zero-based array. I.E. January is 0, not 1.