Define two classes, Patient and Billing, whose objects are records for aclinic. Derive Patient from the class Person given in Listing 8.1. A Patientrecord has the patient’s name (defined in the class Person) and identification number (use the type String). A Billing object will contain aPatient object and a Doctor object (from Practice program 2). Give yourclasses a reasonable complement of constructors and accessor methods,and an equals method as well. First write a driver program to test all yourmethods, then write a test program that creates at least two patients, at leasttwo doctors, and at least two Billing records and then displays the totalincome from the Billing records.

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