Zoom lecture on this assignment 

The outcome of this assignment will be used later in the assignment 4. In the assignment 4, you will add a GUI interface to the result of the assignment 1.

Java 8 introduced new APIs for Date and Time to address the shortcomings of the older java.util.Date and java.util.Calendar. You have to use these new features of Java 8 to manipulate time information in your program. Study the API of classes in java.time package to learn how to manipulate day, week and month of calendar. Here is an example code to learn how to advance a calendar by month, to print a date in a specified format, and to figure out the day of the week for the 1st day of the given month.

In your implementation, ignore cases to recognize a user request and make sure to follow the given example format to enter data. I expect at least 4 classes in your design:

  MyCalendarTester class with a main method

  MyCalendar class that defines an underlying data structure to hold events

  TimeInterval class that represents an interval of time, suitable for events (such as a meeting on a given date from 10:00 - 11:00).

Provide a method to check whether two intervals overlap.

  Event class that represent an event. An event consists of its name and a TimeInterval of the event.

The format of the output from your program can be different from that of the given example outputs.

In this assignment, you will design and implement a calendar similar to the one you can find on 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 using a pair of brackets. (It is not straightforward to highlight on the console. It is fine to use a pair of brackets for this purpose.)

August 2022

Su Mo Tu We Th Fr Sa

1  [2]  3  4  5  6  <--   It is ok if this line is sticking out.

7  8  9 10 11 12 13

14 15 16 17 18 19 20

21 22 23 24 25 26 27

28

When the program starts, it loads events from events.txt and populates the calendar with them. The events.txt is a text file of an event you need to prepare ahead of the program execution.

There are two different types of events the program manages: recurring and one-time.

A recurring event is one that is scheduled every week on the same day or days, such as a lecture that meets every Monday and Wednesday.

A one-time event is scheduled on a particular date, such as 10/15/22, and doesn't repeat.

In the events.txt file, each event takes up two lines.

Recurring event

The first line contains the name of the event which may contain spaces. The second line consists of a sequence of day abbreviations

(SMTWRFA, upper or lower case) followed by a starting date and an ending date of the recurring event.

One time event

The first line contains the name of the event which may contain spaces. The second line consists of a date in the format mm/dd/yy,   e.g. 3/22/22. There cannot be any spaces within a date description. The date description is followed by a starting time and an ending time. For the starting and ending times, only military 24-hour time will be used for simplicity. For example, 18:15 instead of 6:15 pm  The minutes cannot be left off in which case zeros should be specified for the minutes, e.g. 14:00.

Here is a sample events.txt:

CS151 Lecture

TR 10 :30 11 :45 8/23/22 12/6/22

CS157C Lecture

MW 11 :45 13 :15 8/22/22 12/6/22

Interview at BigCorp

9/28/22 9 :30 11 :30

Dentist appt

10/3/22 16 :15 17 :00

Course Committee Meeting

F 18 :30 20 :30  9/20/22 12/9/22

After loading the events, the program prompts "Loading is done!".

The program now displays 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.

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

V

will choose the View by option.

   [V]iew by

The user can choose a Day or a Month view. If a Day view is chosen, the program prints today's 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)      with a pair of brackets {} if any event scheduled on that day. After the selected view is displayed, the calendar gives the user three options: P, N, and G, where P, N, and M stand for Previous, Next and Go back to the main menu, respectively. The previous and next options allow  the user to navigate the current view back and forth. If the day view was selected, the view goes back (P) and forth (N) by day. If the        month view was chosen, the view goes back (P) and forth (N) by month. Here are sample runs:

[D]ay view or [M]view ?

If the user selects D, then today's date is displayed along with scheduled events.

Thu, August 25, 2022

CS151 Lecture : 10 :30 - 11 :45

[P]revious or [N]ext or [G]o back to the main menu ?  <-- The option menu allows the user to choose navigating the Day view or going back to the main men

If the user selects M, then

August 2022

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 [G]o back to main menu ?

Help: The following example code segment shows how to print the given date in a specified format.

LocalDate c = ....

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("E, MMM d yyyy") ;

System.out.println(" " + formatter.format(c)) ;

   [C]reate

This option allows the user to schedule an event. The calendar asks the user to enter the name, date, starting time, and ending time of an event. For simplicity, we consider one-time event only for the Create function. Your program should check if a new event is a conflict with existing events. Please stick to the following format to enter data:

Name: 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.

   [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 an event scheduled on that day in the order of starting time.

   [E]vent list

The user can browse scheduled events. The scheduled events are presented in two categories: One time events and Recurring events. Any canceled events will not show. The calendar displays one-time events in the order of starting date and starting time. Recurring events are presented in the order of starting date. An example presentation of events is as follows: (The format of event strings does not have to be  exactly like this.)

ONE TIME EVENTS

2021

Friday March 15 13 :15 - 14 :00 Dentist

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

2022

...

RECURRING EVENTS

CS157C Lecture

MW 10 :30 11 :45 8/22/22 12/6/22

CS151 Lecture

TR 9 :00 10 :15 8/22/22 12/6/22

   [D]elete

The user can delete an event from the Calendar. There are three different ways to delete an event: Selected, All and DeleteRecurring. Other types of deletion will not be considered for simplicity.

[S]elected: the user specifies the date and name of an ONE TIME event. The specific one time event will be deleted. [A]ll: the user specifies a date and then all ONE TIME events scheduled on the date will be deleted.

[DR]: the user specifies the name of a RECURRING event. The specified recurring event will be deleted. This will delete the recurring event throughout the calendar.

[S]elected  [A]ll   [DR]

Here is a scenario of [S]elected as an example. You may implement [A]ll and [DR] according to the above description. If the user enters S,  then the calendar asks for the date and displays all the events scheduled on that date. The program then asks the name of the event to be deleted and deletes the specified event. If there is no such event, the program promotes an error message.