Add equals and hashCode methods to any class used in a List.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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  1. Add equals and hashCode methods to any class used in a List.

Current Java Code:

package parkingsystem4;
import java.util.LinkedList;
import java.util.List;

public class ParkingOffice {

    String name;
    String address;
    List<Car> cars = new LinkedList<Car>();
    List<Customer> customers = new LinkedList<Customer>();
    List<ParkingLot> lots = new LinkedList<ParkingLot>();
    List<ParkingCharge> charges = new LinkedList<ParkingCharge>();
    
    // Default constructor
    ParkingOffice(){
    }

    // Parameterized constructor
    ParkingOffice(String name, String address, List<Car> parkedCars, List<ParkingLot> lots, List<ParkingCharge> charges){
        this.name = name;
        this.address = address;
        this.cars = parkedCars;
        this.lots = lots;
        this.charges = charges;
    }
    
    public void registerCustomer(Customer registeringCustomer){
        customers.add(registeringCustomer);
    }
    
    public void registerCar(Car registeringCar){
        cars.add(registeringCar);
    }
    
    public void addParkingLot(ParkingLot parkingLot){
        lots.add(parkingLot);
    }
    
    public void addCharge(ParkingCharge parkingCharge) {
        charges.add(parkingCharge);
    }
    
    public void printRegisteredCars() {
        System.out.println("");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("The Parking Office has the following cars registered");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        for (int i = 0; i < cars.size(); i++) {
            System.out.println(cars.get(i));
        }
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("");
    }
    
    public void printParkingLots() {
        System.out.println("");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("The Parking Office has the following parking lots");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        for (int i = 0; i < lots.size(); i++) {
            System.out.println(lots.get(i));
        }
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("");
    }
    
    public void printCustomers() {
        System.out.println("");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("The Parking Office has the following registered customers");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        for (int i = 0; i < customers.size(); i++) {
            System.out.println(customers.get(i));
        }
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("");
    }
    
    public void printCharges() {
        System.out.println("");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("The Parking Office has the following charges");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++");

    }
}

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Operations of Linked List
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