Question

1. main

The main method instantiates an ArrayList object, using the Car class. So, the ArrayList will be filled with Car objects.

It will call the displayMenu method to display the menu.

Use a sentinel-controlled loop to read the user’s choice from stdin, call the appropriate method based on their choice, and redisplay the menu by calling displayMenu.

Be sure to use the most appropriate statement for this type of repetition.

2. displayMenu

Parameters:             none
Return value:          none
Be sure to use the keyword static!

This method displays the menu, which should look like this:

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice:

Note that displayMenu should NOT read the user’s choice. It should only display. Main will read user input.

3. addData

Parameters:             one ArrayList of type Car
Return value:          none

Be sure to use the keyword static!

This method prompts the user for the type and price of the car to be added. Instantiate a Car object with this information, and then call the add() method of the ArrayList object using this Car object.

4. deleteData

Parameters:             one ArrayList of type Car
Return value:          none

Be sure to use the keyword static!

This method prompts the user for the type of car to delete. Use a standard for loop to iterate through the ArrayList object until a match is found. If a match is found, call the remove() method of the ArrayList object, using the appropriate index for that element. If a match is not found, display a warning message.

5. printData

Parameters:             one ArrayList of type Car
Return value:          none

Be sure to use the keyword static!

This method uses the enhanced for loop syntax to iterate through the ArrayList and displays each car’s information in a neatly formatted list. The price must include a comma, and the prices must align on the right. Remember, you’re calling the get methods of the Car object at each position in the ArrayList.

Sample Run

Welcome to the JJC Car Dealership Inventory Program

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice: 1

Type of car: Ford

Price of car: 21000

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice: 1

Type of car: Honda

Price of car: 23000

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice: 3

Make                    Price

----                   -----

Ford                   21,000

Honda                  23,000

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice: 2

Type of car to delete: Ford

Ford deleted from inventory

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice: 3

Make                    Price

----                   -----

Honda               23,000

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice: 2

Type of car to delete: VW

No such car in inventory

1. Add a car to inventory

2. Delete a car from inventory

3. Print inventory

4. Exit

Your choice: 4

this is my code as of right now:

public class Car {
private String make; // make of car as a string
private int price; // price of vechile
  
// two agruement constructor initialize make and price array
public Car(String make, int price) {
this.make = make;
this.price = price;
}

public String getMake() {
return make;
}

public int getPrice() {
return price;
}
  
}// end of Car class

import java.util.ArrayList;
import java.util.Scanner;

public class Dealer {
public static void main(String[] args) {
// creates a new arraylist of strings
ArrayList<String> carlist = new ArrayList<String>();

// creates a Scanner object to obtain input from the command window
Scanner input = new Scanner(System.in);

// display menu
System.out.printf("Welcome to the JJC Car Dealership Inventory Program%n%n");
displayMenu();
  
// reads input from user
int inputs = input.nextInt();
  
while (inputs != 4){
// use if/else statements for user menu
if (inputs == 1){
// calls addData method
addData(carlist);
  
}// end of if input menu is 1 from user
else if (inputs == 2){
// calls deleteData method
deleteData(carlist);
}// end of if else from user entering 2 from menu
else if (inputs == 3){
printData(carlist);
}
  
displayMenu();
inputs = input.nextInt();
}// end of while
  
}// end of main
  
public static void displayMenu (){
// users choice in menu
System.out.printf("%n1. Add a car to inventory%n2. Delete a car from inventory%n3. Print inventory%n4. Exit%n%n");
  
System.out.printf("Your Choice: ");
}// end of displayMenu method
  
public static void addData(ArrayList<String> car){
System.out.printf("%nType of car: "); // prints user for type of car
Scanner addCar = new Scanner(System.in); // creates addCar object to read user input
String make = addCar.nextLine();// reads user input
  
System.out.printf("Price of car: ");// prints user for price of car
Scanner addPrice = new Scanner(System.in); // creates addPrice object to read user inpiy
int price = addPrice.nextInt(); // read user input

}// end of addData method
  
public static void deleteData(ArrayList<String> car){
ArrayList<String> carlist = new ArrayList<String>();
System.out.printf("%nType of car to delete: ");
Scanner deleteCar = new Scanner(System.in);
String delete = (deleteCar.nextLine());
  
}// end of deleteData method
  
public static void printData(ArrayList<String> car){
  
// print inventory
System.out.printf("%nMake Price%n");
System.out.printf("---- -----%n");
// display each element in car
for (String cars : car){
System.out.printf("%s", cars);
}

}// end of printData method
  
}// end of Dealer class

question, how do i use the arraylist to get car make and price and display it with commas. Also making a method to add a new car and price and delete the car along with its price?

Answer 1

I have changed the Dealer class, Car class is unchanged. The changed in Dealer class are highlighted

import java.util.ArrayList;
import java.util.Scanner;

public class Dealer {
public static void main(String[] args) {
// creates a new arraylist of strings
ArrayList carlist = new ArrayList<Car>();

// creates a Scanner object to obtain input from the command window
Scanner input = new Scanner(System.in);

// display menu
System.out.printf("Welcome to the JJC Car Dealership Inventory Program%n%n");
displayMenu();

// reads input from user
int inputs = input.nextInt();

while (inputs != 4){
// use if/else statements for user menu
if (inputs == 1){
// calls addData method
addData(carlist);

}// end of if input menu is 1 from user
else if (inputs == 2){
// calls deleteData method
deleteData(carlist);
}// end of if else from user entering 2 from menu
else if (inputs == 3){
printData(carlist);
}

displayMenu();
inputs = input.nextInt();
}// end of while

}// end of main

public static void displayMenu (){
// users choice in menu
System.out.printf("%n1. Add a car to inventory%n2. Delete a car from inventory%n3. Print inventory%n4. Exit%n%n");

System.out.printf("Your Choice: ");
}// end of displayMenu method

public static void addData(ArrayList<Car> car){
System.out.printf("%nType of car: "); // prints user for type of car
Scanner addCar = new Scanner(System.in); // creates addCar object to read user input
String make = addCar.nextLine();// reads user input

System.out.printf("Price of car: ");// prints user for price of car
Scanner addPrice = new Scanner(System.in); // creates addPrice object to read user inpiy
int price = addPrice.nextInt(); // read user input
car.add(car.size(),new Car(make,price));//creating a new car object and adding it to the arrayList
}// end of addData method

public static void deleteData(ArrayList<Car> car){
ArrayList carlist = new ArrayList<Car>();
System.out.printf("%nType of car to delete: ");
Scanner deleteCar = new Scanner(System.in);
String delete = (deleteCar.nextLine());
for (int i=0;i<car.size();i++){
if( car.get(i).getMake().equals(delete)){//searching the index of the particular car name and delete it from the arrayList
    car.remove(i);
}
}
}// end of deleteData method

public static void printData(ArrayList<Car> car){

// print inventory
System.out.printf("%nMake\tPrice%n");
System.out.printf("------------------%n");
// display each element in car
for (int i=0;i<car.size();i++){
System.out.println( car.get(i).getMake()+"\t"+ car.get(i).getPrice());//printing the details of the cars in the inventory
}

}// end of printData method

}// end of Dea

Output:

run:
Welcome to the JJC Car Dealership Inventory Program

1. Add a car to inventory
2. Delete a car from inventory
3. Print inventory
4. Exit

Your Choice: 1

Type of car: ford
Price of car: 200

1. Add a car to inventory
2. Delete a car from inventory
3. Print inventory
4. Exit

Your Choice: 3

Make   Price
------------------
ford   200

1. Add a car to inventory
2. Delete a car from inventory
3. Print inventory
4. Exit

Your Choice: 2

Type of car to delete: ford

1. Add a car to inventory
2. Delete a car from inventory
3. Print inventory
4. Exit

Your Choice: 3

Make   Price
------------------

1. Add a car to inventory
2. Delete a car from inventory
3. Print inventory
4. Exit

Your Choice: 4
BUILD SUCCESSFUL (total time: 29 seconds)