The GregorianCalendar class describes a point in time, as measured by the Gregorian calendar, the standard calendar that is commonly used throughout the world today. You construct a GregorianCalendar object from a year, month, and day of the month, like this:

GregorianCalendar cal = new GregorianCalendar(); // Today’s date

GregorianCalendar eckertsBirthday = new GregorianCalendar(1919,

Calendar.APRIL, 9);

Use the values Calendar.JANUARY . . . Calendar.DECEMBER to specify the month.

The add method can be used to add a number of days to a GregorianCalendar object:

cal.add(Calendar.DAY_OF_MONTH, 10); // Now cal is ten days from today

This is a mutator method—it changes the cal object.

The get method can be used to query a given GregorianCalendar object:

int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);

int month = cal.get(Calendar.MONTH);

int year = cal.get(Calendar.YEAR);

int weekday = cal.get(Calendar.DAY_OF_WEEK);

// 1 is Sunday, 2 is Monday, . . . , 7 is Saturday

Your task is to write a program that prints the following information:

• The date and weekday that is 100 days from today

• The weekday of your birthday

• The date that is 10,000 days from your birthday

Use the birthday of a computer scientist if you don’t want to reveal your own birthday.