Study java.util.GregorianCalendar to learn how to manipulate day

computer science


Study java.util.GregorianCalendar to learn how to manipulate day, week and month of calendar. Also,

here is an example I wrote for you to reference.

In your implementation, ignore cases to recognize a user request and make sure to follow the given

example format to enter data.

In this assignment, you will design and implement a calendar similar to one you can find in your phone. The

calendar is going to be implemented as a console application.

The initial screen shows the current month looking like this. It also highlights today's date, for example, using

a pair of brackets. (It is not straightforward to highlight on console. It is fine to use a pair of brackets for this


February 2017

Su Mo Tu We Th Fr Sa

1 2 3 4

5 6 7 8 9 10 11

12 13 14 15 16 17 18

19 20 21 22 23 24 25

26 [27] 28 <--- it is ok if [27] is sticking out.

The initial screen comes with a main menu with following options: View by, Create, Go to, Event list, Delete,

and Quit. After the function of an option is done, the main menu is displayed again for the user to choose the

next option.

Select one of the following options:

[L]oad [V]iew by [C]reate, [G]o to [E]vent list [D]elete [Q]uit

The user may enter one of the letter highlighted with a pair of bracket to choose an option. For example,


will choose the View by option.


The system loads events.txt to populate the calendar. If there is no such file because it is the first run,

the load function prompts a message to the user indicating this is the first run. You may use Java

serialization this function.

[V]iew by

User can choose a Day or a Month view. If a Day view is chosen, the calendar displays the current

date. If there is an event(s) scheduled on that day, display them in the order of start time of the event.

With a Month view, it displays the current month and highlights day(s) if any event scheduled on that

day. After a view is displayed, the calendar gives the user three options: P, N, and M, where P, N, and

M stand for previous, next, and main menu, respectively. The previous and next options allow the user

to navigate the calendar back and forth by day if the calendar is in a day view or by month if it is in a

month view. If the user selects m, navigation is done, and the user gets to access the main menu again.

[D]ay view or [M]view ?

If the user selects D, then

Tuesday, Feb 27, 2017

Dr. Kim's office hour 9:15 - 10:15

[P]revious or [N]ext or [M]ain menu ?

If the user selects M, then

February 2017

Su Mo Tu We Th Fr Sa

1 2 3 4

5 6 7 8 9 10 11

12 13 14 15 16 17 18

19 20 21 22 23 24 25

26 27 28

[P]revious or [N]ext or [M]ain menu ?


This option allows the user to schedule an event. The calendar asks the user to enter the title, date,

starting time, and ending time of an event. For simplicity, we consider one day event only. Also, let's

assume there is no conflict between events that user entered, and therefore your program doesn't have

to check if a new event is conflict with existing events. Please stick to the following format to enter


Title: a string (doesn't have to be one word)

date: MM/DD/YYYY

Starting time and ending time: 24 hour clock such as 06:00 for 6 AM and 15:30 for 3:30 PM.

The user may not enter ending time if an ending time doesn't make sense for the event (e.g.

leaving for Korea event may have a starting time but no ending time.)

[G]o to

With this option, the user is asked to enter a date in the form of MM/DD/YYYY and then the calendar

displays the Day view of the requested date including any event scheduled on that day in the order of

starting time.

[E]vent list

The user can browse scheduled events. The calendar displays all the events scheduled in the calendar in

the order of starting date and starting time. An example presentation of events is as follows:


Friday March 17 13:15 - 14:00 Dentist

Tuesday April 25 15:00 - 16:00 Job Interview


Friday June 2 17:00 Leave for Korea


User can delete an event from the Calendar. There are two different ways to delete an event: Selected

and All. Other type of deletion will not be considered for simplicity.

[S]elected: all the events scheduled on the selected date will be deleted.

[A]ll: all the events scheduled on this calendar will be deleted.

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