Question

Use your Car class from the previous Programming Assignment. For this assignment, create a new class that represents a Used Car Dealership. Your Java program will simulate an inventory system for the dealership, where the employees can manage the car information. Start by creating an array of 10 cars, with an "ID" of 0 through 9, and use the default constructor to create each car. For example, the third car in an array called cars would have ID 2. You would access it by using:

cars[2]

(Note: This is not a complete Java statement)

To display this car's information, you would use:

cars[2].toString();

Hint: Use a loop to help you initialize each car.

The system should first prompt the user for an ID, and ensure that it is valid (0 through 9). Once the id is accepted, the menu should be displayed:

1. Set Make - Get the new Make from the user, and set it to this car's Make field
2. Set Model - Get the new Model from the user, and set it to this car's Model field
3. Set Year - Get the new Year from the user, and set it to this car's Year field
4. Set Cost - Get the new Cost from the user, and set it to this car's Cost field
5. Set Color - Get the new Color from the user, and set it to this car's Color field
6. Display Car Information
7. Exit, and choose new car ID

Any other menu option should give the user a message letting them know it was invalid. The program should run continuously. The "Exit" option will prompt the user to select a new ID and begin entering/displaying information for a different car.

Answer 1

// Car.java

public class Car {

      

       private String make;

       private String model;

       private int year;

       private double cost;

       private String color;

      

       public Car()

       {

             make="";

             model="";

             year = 0;

             color = "";

             cost = 0;

       }

      

       public Car(String make, String model, int year, double cost, String color)

       {

             this.make = make;

             this.model = model;

             this.year = year;

             this.cost = cost;

             this.color = color;

       }

      

       public void setMake(String make)

       {

             this.make = make;

       }

      

       public void setModel(String model)

       {

             this.model = model;

       }

      

       public void setYear(int year)

       {

             this.year = year;

       }

      

       public void setCost(double cost)

       {

             this.cost = cost;

       }

      

       public void setColor(String color)

       {

             this.color = color;

       }

      

       public String getMake()

       {

             return make;

       }

      

       public String getModel()

       {

             return model;

       }

      

       public double getCost()

       {

             return cost;

       }

      

       public int getYear()

       {

             return year;

       }

      

       public String getColor()

       {

             return color;

       }

      

       public String toString()

       {

             return("Make : "+make+" Model : "+model+" Year : "+year+" Color : "+color);

       }

}

//end of Car.java

// CarDealership.java: Java program to implement a Used Car Dealership

import java.util.Scanner;

public class CarDealership {

      

       public static void main(String[] args) {

             Car cars[] = new Car[10]; // create an array of 10 cars

            

             int id, choice;

             String make,model,color;

             int year;

             double cost;

            

             Scanner scan = new Scanner(System.in);

             // initialize the 10 cars

             for(int i=0;i<10;i++)

                    cars[i] = new Car();

             // loop that continues till the user exits

             while(true)

             {

                    // input of id of the car

                    System.out.print("Enter id of the car(-1 to exit) : ");

                    id = scan.nextInt();

                    scan.nextLine();

                    // check if user wants to exit

                    if(id == -1)

                           break;

                    // check if id is invalid

                    else if(id < 0 || id > 9)

                    {

                           System.out.println("Invalid id. Id of the car should be between 0-9");

                    }else

                    {

                           // loop that continues till the user exits

                           do

                           {

                                 System.out.println("1. Set Make");

                                 System.out.println("2. Set Model");

                                 System.out.println("3. Set Year");

                                 System.out.println("4. Set Cost");

                                 System.out.println("5. Set Color");

                                 System.out.println("6. Display Car Information");

                                 System.out.println("7. Exit, and choose new car ID");

                                 System.out.print("Enter choice(1-7) : ");

                                 choice = scan.nextInt();

                                 scan.nextLine();

                                

                                 // perform the operation based on the choice

                                 switch(choice)

                                 {

                                 case 1:

                                        System.out.print("Enter make of the car : ");

                                        make = scan.nextLine();

                                        cars[id].setMake(make);

                                        break;

                                       

                                 case 2:

                                        System.out.print("Enter model of the car : ");

                                        model = scan.nextLine();

                                        cars[id].setModel(model);

                                        break;

                                       

                                 case 3:

                                        System.out.print("Enter year of the car : ");

                                        year = scan.nextInt();

                                        scan.nextLine();

                                        cars[id].setYear(year);

                                        break;

                                       

                                 case 4:

                                        System.out.print("Enter cost of the car : ");

                                        cost = scan.nextDouble();

                                        scan.nextLine();

                                        cars[id].setCost(cost);

                                        break;

                                       

                                 case 5:

                                        System.out.print("Enter color of the car : ");

                                        color = scan.nextLine();

                                        cars[id].setColor(color);

                                        break;

                                       

                                 case 6:

                                        System.out.println(cars[id].toString());

                                        break;

                                 case 7:

                                        break;

                                 default:

                                        System.out.println("Invalid choice");

                                       

                                 }

                           }while(choice != 7);

                          

                    }

             }

            

             scan.close();

       }

}

//end of CarDealership.java

Output: