Java expert please help me the program below. Here is requirement from my professor::

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You are to write the following PersonalCalendar, Event and Appointment classes and other interfaces or classes as necessary. Note that there is no main method required in this assignment; a JUnit test will be used instead.

Some details of the implementation are left to you. Other details are implied, but not stated directly, in the description. (That said, don't over think this; do the minimum required to perform the specified function.)

You are to write a class PersonalCalendar. Entries in a PersonalCalendar can be either an Event or an Appointment. Entries can be added to, returned from and removed from the PersonalCalendar.

An Event has a date consisting of ints for year, month, dayOfMonth, hour and minute. It also has a String description, a String location and an int duration in minutes. Events do not have attendees. Two Event objects are equal if their dates and descriptions are equal.

An Appointment has a date consisting of ints for year, month, dayOfMonth, hour and minute. It has an int duration in minutes and a String description. An Appointment also has an ArrayList of Strings for attendees. Attendees can be added to an Appointment. An Appointment does not have a location--that's assumed to be my office. Appointment has an equals method that compares dates and descriptions to determine equality.

A PersonalCalendar maintains its entries sorted by date, not the order the entries were inserted. Thus the first element of a PersonalCalendar is always the fist element chronologically, regardless of the order the elements were added. If two elements have exactly the same date and time, description is used to break the tie. (Hint: GregorianCalendar and Collections.sort. Also let your IDE help you write commonly used code.)

You are to write a JUnit test to verify that a PersonalCalendar object maintains its entries in the correct order.

Here are some bullets I will use in grading

PersonalCalendar accepts both Event and Appointment objects

PersonalCalendar does not accept objects such as String

PersonalCalendar keeps its content sorted appropriately

Event implements the specified function

Appointment implements the specified function

JUnit tests verify the following:

A PersonalCalendar with a single Appointment or Event contains the expected object.

A PersonalCalendar returns its objects sorted first by date and then description, regardless of the order the objects were added, and regardless of whether the items were all Events, or all Appointments, or a mixture.

My JUnit test class was long, but that was mostly because I did a lot of copy/paste for test setup. None my other components were more than 50 lines of code.

You are to write the following PersonalCalendar, Event and Appointment classes and other interfaces or classes as necessary. Note that there is no main method required in this assignment; a JUnit test be used instead. Some details of the implementation are left to you. Other details are implied, but not stated directly, in the description. That said, dont over think this: do the minimum required to perform the specified function You are to write a class Personal Calendar. Entries in a Personal Calendar can be either an Event or an Appointment Entries can be added to, returned from and removed from the PersonalCalendar. vent month, day OfMonth, hour and minute. It also has a String description, a String location and an int duration in minutes. Events do not have attendees. Two has a date consisting of ints for year An Event objects are equal if their dates and descriptions are equal An Appointment has a date consisting of ints for year, month, dayOfMonth, hour and minute. It has an int duration in minutes and a String description. An Appointment also has an AmayList of Strings for attendees. Attendees can be added to an Appointment. An Appointment does not have a location-that's assumed to be my office. Appointment has an equals method that compares dates and descriptions to determine equality. A Personal Calendar maintains its entries sorted by date, not the order the entries were inserted. Thus the first element of a PersonalCalendaris always the fist element chronologically, regardless of the order exactly the same date and time, description is used to break the tie. (Hint: Gregoriancalendar and Collections sort. Also let your IDE help you write ere added. If two elements have he elements w commonly used code You are to write a JUnit est to verify that a PersonalCalendar object maintains its entries in the comect order. Here are some bullets I will use in grading Personal Calendar accepts both Event and Appointment objects Personal Calendar does not accept jects such as String Personal Calendar keeps its content sorted appropriately Event implements the specified function Appointment implements the specified function JUnit ests verify the following o A PersonalCalendar with a single Appointment or vent contains the expected object o A PersonalCalendar retums its objects sorted first by date and then description, regardless of the order the objects were added, and regardless of whether the items were all Events, or all Appointments, or a mixture. You are to write the following PersonalCalendar, Event and Appointment classes and other interfaces or classes as necessary. Note that there is no main method required in this assignment; a JUnit test be used instead. Some details of the implementation are left to you. Other details are implied, but not stated directly, in the description. That said, dont over think this: do the minimum required to perform the specified function You are to write a class Personal Calendar. Entries in a Personal Calendar can be either an Event or an Appointment Entries can be added to, returned from and removed from the PersonalCalendar. vent month, day OfMonth, hour and minute. It also has a String description, a String location and an int duration in minutes. Events do not have attendees. Two has a date consisting of ints for year An Event objects are equal if their dates and descriptions are equal An Appointment has a date consisting of ints for year, month, dayOfMonth, hour and minute. It has an int duration in minutes and a String description. An Appointment also has an AmayList of Strings for attendees. Attendees can be added to an Appointment. An Appointment does not have a location-that's assumed to be my office. Appointment has an equals method that compares dates and descriptions to determine equality. A Personal Calendar maintains its entries sorted by date, not the order the entries were inserted. Thus the first element of a PersonalCalendaris always the fist element chronologically, regardless of the order exactly the same date and time, description is used to break the tie. (Hint: Gregoriancalendar and Collections sort. Also let your IDE help you write ere added. If two elements have he elements w commonly used code You are to write a JUnit est to verify that a PersonalCalendar object maintains its entries in the comect order. Here are some bullets I will use in grading Personal Calendar accepts both Event and Appointment objects Personal Calendar does not accept jects such as String Personal Calendar keeps its content sorted appropriately Event implements the specified function Appointment implements the specified function JUnit ests verify the following o A PersonalCalendar with a single Appointment or vent contains the expected object o A PersonalCalendar retums its objects sorted first by date and then description, regardless of the order the objects were added, and regardless of whether the items were all Events, or all Appointments, or a mixture