Java formats

In this assignment, you will write a class that implements a contact book entry. For example, my iPhone (and pretty much any smartphone) has a contacts list app that allows you to store information about your friends, colleagues, and businesses. In later assignments, you will have to implement this type of app (as a command line program, of course.) For now, you wil just have to implement the building blocks for this app, namely, the Contact class. .The first name of the person The last name of the person The phone number of the person The street address of the person The city of the persorn The state of the person The Contact class should implement the Comparable interface. More on this later Of course, you may implement private helper methods if it helps your implementation. A constructor that initializes all the fields with information A constructor that initializes only the name and phone number accessor (getter) methods for all of the data members. an update method that allows the user to change all information. (They must change all of it) An overridden equals method that can tell if one Contact is the same as another It should have the method signature public boolean equals (0bject obj); We will define one Contact as being the same as another contact if the first and last names both match. (Be careful! The parameter may not be a bona fide Contact!) An overridden toString) method that creates a printable representation for a Contact object. It should have the method signature: public String toString); The String should be created in the following form: First name last name Phone number: city, state For example my contact info would look like: Ari Mermelstein 2900 Beford Avenue Brooklyn, NY Phone number: (718) 111-1111 A comparison method that looks like this: public int compareTo (Contact another); If the last name of "another" is lexicographically first, return a positive If the last name of "another" is lexicographically second, return a negative If the last names are the same and the first names are also the same, return 0 We will define this method in the following way: number number If the last names are the same and the first names are different, use the first names to determine the order You must also declare the fact that Contact implements the Comparable interface You can choose to write thi same directory as the Contact class, or you can just make the main program the main program of the Contact class itself. It doesn't matter much to me is main program as a stand alone class that sits in the Your Contact.java file (Your main program class if it is separate)