use gregorian class and also add if date entered does not exsist print out "date invalid". write in java

A Calendar Class In this project, you will develop and test a CalendarDate class. Here are the responsibilities of the class, that is, the services that the class will provide to users: 1. To initialize a Calendar Date object to represent the date January 1, 2012; 2. To initialize a Calendar Date object from integers for the month, day-of-month and year; if the date is invalid (for example, if the month, day-of-month and year are 6, 31 and 2006, respectively) use 1, 1, 2012; 3. Return, in String form, the next date after this CalendarDate object; for example, if this Calendar Date object represents January 31, 2012, the return value would be February 1, 2012"; 4. Return, in String form, the date prior to this CalendarDate object; for example, if this CalendarDate object represent January 1, 2013, the return value would be "December 31, 2012"; 5. Return, in String form, the day of the week on which this CalendarDate object falls: for example, if this CalendarDate object represents the date December 20, 2012, the returned value will be "Thursday"; Part a: Create method specifications for the above responsibilities. Part b: Develop the Calendar Date class, that is, determine what fields to declare and then define the methods. Part c: Create a project to test your CalendarDate class. Call each CalendarDate method at least twice