Language/Type: Java classes Write a class of objects named Circle that remembers information about a circle. You must include the following public members. It may help you to know that there is a constant named Math.PI storing the value of л, roughly 3.14159. member name Circle(r) area() circumference() getRadius () toString() description constructs a new circle with the given radius as a real number returns the area occupied by the circle returns the distance around the circle returns the radius as a real number returns a string representation such as "Circle(radius=2.5}" You should define the entire class including the class heading, the private fields, and the declarations and definitions of all the public methods and constructor.

Using classes, design an online address book to keep track of the names, addresses, phone numbers, and dates of birth of family members, close friends, and certain business associates. Your program should be able to handle a maximum of 500 entries. Define a class addressType that can store a street address, city, state, and ZIP code. Use the appropriate functions to print and store the address. Also, use constructors to automatically initialize the member variables. Define a class extPersonType using the class personType (as defined in Example 10-10, Chapter 10), the class dateType (as designed in this chapters Programming Exercise 2), and the class addressType. Add a member variable to this class to classify the person as a family member, friend, or business associate. Also, add a member variable to store the phone number. Add (or override) the functions to print and store the appropriate information. Use constructors to automatically initialize the member variables. Define the class addressBookType using the previously defined classes. An object of the type addressBookType should be able to process a maximum of 500 entries. The program should perform the following operations: Load the data into the address book from a disk. Sort the address book by last name. Search for a person by last name. Print the address, phone number, and date of birth (if it exists) of a given person. Print the names of the people whose birthdays are in a given month. Print the names of all the people between two last names. Depending on the users request, print the names of all family members, friends, or business associates.