Can anyone pls explain

Question

Can anyone pls explain this part of the code.
DateFormat dateFormat = new SimpleDateFormat ("MM/dd/yyyy");
Date birthDate = dateFormat.parse (birthDateString);
Calendar day = Calendar.getInstance();
day.setTime (birthDate);
int day   = day.get (Calendar.DAY_OF_MONTH);
int month = day.get (Calendar.MONTH);
int year  = day.get (Calendar.YEAR);

Answer 1

Well, read my comments prior to each statement below...
You should also consider reading the API docs for the used classes, if you need more details...
// Crate a new DateFormatObject for formatting dates according to the specified pattern
DateFormat dateFormat = new SimpleDateFormat ("MM/dd/yyyy");
// Parse the provided String into a Date object
// Note that if the String does not provide for a valid Date you'll get an exception
Date birthDate = dateFormat.parse("30/08/1980");
// Get a new calendar instace
Calendar day = Calendar.getInstance();
// Reset the date in the calendar to the newly created date object
// Now the calendar represents the date in the day object
day.setTime (birthDate);
// Get the day of the month from the calendar
// Note that your code snippet contained int day = ... this will cause an exception as day was already
// defined!
int d = day.get (Calendar.DAY_OF_MONTH);
// Get the month of the year from the calendar
// Note that Jan will be returned as 0, so if you have to add one to the retrieved month value
int m = day.get (Calendar.MONTH);
// Get the year from the calendar
int y = day.get (Calendar.YEAR);Hope that helps...