class Animal{} class Dog extends Animal{} class Wolf extends Animal{} public class HelloWorld{ public static void main (String [] args) Animal a; Dog d = new Dog(); //Line1 Wolf w = new Wolf(); //Line2 a = d; d = (Dog) a; //Line3 //Line4 w = (Wolf) a; //Line5
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- Java 2 billBook -invoiceNumber: String-visitDate: String-patientName: String-paid: boolean -bills: bill[]-doctor: String +bill(all parameters)+Setters/getters methods(ifneeded)+printInvoice(): void +billBook(doctor:String,capacity:int)+Setters/getters methods (if needed)+addBills(): void+payBill(invoiceNumber: String): int Implement the class bill:a. Write the constructor that takes as parameters all data fields except the paid value. Abill object is by defauld not paid.b. The printInvoice() method should output the following information: The invoiceNumber, the visitDate, the name of the patient name A message “The bill is paid” or “The bill is not paid” according to the value of the field paid.2. Implement the class billBook using the above UML:a. Write the constructor that takes as parameters the name of the doctor who hasexamined the patient and the capacity which represents the size of the array bills.b. Write the method addBills that reads the information of bill objects from…import java.util.*; public class Car implements Comparable<Car>{ private int m_inventory; // the number of cars of this make/model private String m_make; // the make of a car private String m_model; // the model of a car // Creates a new car. // This takes the inventory as a String but the inventory is // stored in the class as an integer. As a result, you must // convert the inventory to an integer. // This Should also set inventory to 0 if the inventory passed // is not a valid integer. public Car(String inventory, String make, String model) { // TODO: Part 6 - use a try/catch to set inventory to 0 // if the inventory is not a valid integer m_inventory = Integer.parseInt(inventory); m_make = make; m_model = model; } // Returns the inventory of cars of this make/model. public int getInventory() { // TODO: Part 1 } // Increases the inventory by one. public void…Polymorphism in Java In the class “Phone”, there is a method call() which in default prints “Calling Emergency services…”. Override this method by accepting a string called number. Accept for a number as input. If input is 0, call the default method. Inputs 1. A string 1234567 Sample Output Enter number: 1234567 Calling number 1234567...