Question

*** FOR A BEGINNER LEVEL JAVA CLASS, PLEASE KEEP CODE SIMPLE, AND WE USE BLUE J IN CLASS (IF IT DOESNT MATTER PLEASE COMMENT TELLING WHICH PROGRAM YOU USED TO WRITE THE CODE, PREFERRED IS BLUE J!!)***

ArrayList of Objects and Input File

Use BlueJ to write a program that reads a sequence of data for several car objects from an input file. It stores the data in an ArrayList<Car> list . Program should work for input file containing info for any number of cars. (You should not assume that it will always be seven lines in the input file). Use notepad to create input file "inData.txt". File should be stored in the same folder where all files from BlueJ for this program are located.
Class Car describes one car object and has variables vin, make , model of String type, cost of type double, and year of int type. Variable vin is vehicle identification number and consist of digits and letters . In addition, class Car has methods:
public String getModel()     // returns car’s model
public int getYear()   // returns car’s year
public boolean isExpensive() // returns true if car has cost above 30000 and false
//otherwise
public boolean isAntique() // returns true if car’s year is before 1968, and false
// otherwise
public String toString() // returns string with all car’s data in one line
// separated by tabs.
  
Design class CarList that has instance variable list which is of ArrayList<Car> type. Variable list is initialized in the constructor by reading data for each car from an input file. Each line of input file "inData.txt" has vin, make, model, cost, and year data in this order, and separated by a space. Input file should contain 7 cars. The data for the first five cars in the input file should be as follows:
1234567CS2 Subaru Impreza 27000 2018
1233219CS2 Toyota Camry 31000 2004
9876543CS2 Ford Mustang 45000 1960
3456789CS2 Toyota Tercel 20000 2004
4567890CS2 Crysler Royal 31000 1960

Add remaining two cars of your choice.

Class CarList also has the following methods:
public void printList() // Prints title followed by list of all cars (each row has data
//for one car)
public void printExpensiveCars() //Prints "List of expensive cars:" followed by
// complete data for each expensive car
public Car oldestCar() // Method returns oldest Car (which has smallest year.)
// In case of multiple cars with same smallest year
// return first such car in the list.
public int countCarsWithModel(String model) // Method accepts a model
//and returns count of cars with given model.
public ArrayList<Car> antiqueCarList() // Returns ArrayList of all antique
//cars from the list. The method antiqueCarList is extra credit worth 1 point.

The last three methods just return the specified data type. Do not print anything within those methods. Just return result, and have explanation printed at the place where those methods are invoked.
Class TestCarList will have main method. In it, instantiate an object from CarList class and use it to invoke each of the five methods from CarList class. If method countCarsWithModel returns zero, report that there are no cars with specified model, and otherwise provide count with full sentence.

NOTE: Do not forget to append throws IOException to the constructor of CarList class and main method header in class TestCarList. In addition, you have to provide
import java.io.*;
import java.util.*;
in order to use Scanner and ArrayList classes from Java.

SUBMIT a single word or PDF document named p1_yourLastName_CS152 with the following:
Your name, class section and project number and date of submission in the upper left corner
Copy of the code for each class in separate rectangle
Copy of your input file
Picture of program run from BlueJ.

Answer 1

There are total of 3 files.

1. Car.java which contains all the methods.

2. CarList.java which contains the car list and all the methods

3. TestCarList.java which contains the main method to test our CarList

Additionally, I added comments for each and every method.

Also, I am attaching blueJ screenshots.

Code for Car.java class

class Car

{

    private String vin;

    private String make;

    private String model;

    private double cost;

    private int year;

    // Constructor to create car class object

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

        this.vin = vin;

        this.make = make;

        this.model = model;

        this.cost = cost;

        this.year = year;

    }

    // returns car’s model

    public String getModel()

    {

        return model;

    }

    // returns car’s year

    public int getYear()

    {

        return year;

    }

    // returns true if car has cost above 30000 and false otherwise

    public boolean isExpensive()

    {

        if(cost > 30000){

            return true;

        }

        return false;

    }

    // returns true if car’s year is before 1968, and false otherwise

    public boolean isAntique()

    {

        if(year < 1968){

            return true;

        }

        return false;

    }

    // returns string with all car’s data in one line separated by tabs.

    public String toString()

    {

        String s = vin + "\t" + make + "\t" + model + "\t" + cost + "\t" + year ;

        return s;

    }

}

Code for CarList.java

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.ArrayList;

class CarList {

    private ArrayList<Car> carList;

    // Constructor to read all car details from text file

    // In this Method, line by line is stored in string and then each line is converted into array of string using split method.

    // We pass space " " to split the words separated by space and then create a car class object and add into carList

    public CarList(String fileName) throws IOException {

        carList = new ArrayList<Car>();

        String[] words;

        

            BufferedReader reader = new BufferedReader(new FileReader(fileName));

            String line = reader.readLine();

            while (line != null) {

                words = line.split(" ");

                Car car = new Car(words[0], words[1], words[2], Integer.parseInt(words[3]), Integer.parseInt(words[4]));

                carList.add(car);

                line = reader.readLine();

            }

            reader.close();

    }

    // Prints title followed by list of all cars (each row has data for one car)

    public void printList() {

        for (Car car : carList) {

            System.out.println(car.toString());

        }

    }

    //Prints "List of expensive cars:" followed by complete data for each expensive car

    public void printExpensiveCar()

    {

        System.out.println("List of expensive cars:");

        for (Car car : carList) {

            if(car.isExpensive()){

                System.out.println(car.toString());

            }

        }

    }

    // Method returns oldest Car (which has smallest year.)

    public Car oldestCar() {

        int year = carList.get(0).getYear();

        for (Car car : carList) {

            if (car.getYear() < year) {

                year = car.getYear();

            }

        }

        for (Car car : carList) {

            if (year == car.getYear()) {

                return car;

            }

        }

        return null;

    }

    // Method accepts a model and returns count of cars with given model.

    public int countCarsWithModel(String model) {

        int count = 0;

        for (Car car : carList) {

            if (car.getModel().equals(model)) {

                count += 1;

            }

        }

        return count;

    }

    // Returns ArrayList of all antique cars from the list

    public ArrayList<Car> antiqueCarList() {

        ArrayList<Car> listOfAntiqueCars = new ArrayList<Car>();

        for (Car car : carList) {

            if (car.isAntique()) {

                listOfAntiqueCars.add(car);

            }

        }

        return listOfAntiqueCars;

    }

}

Code for TestCarList.java

import java.io.IOException;

import java.util.ArrayList;

import java.util.Scanner;

public class TestCarList

{

    public static void main(String[] args) throws IOException{

        // Reading the file name from user in which car details are stored

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the text file name in which car details are stored");

        String fileName = sc.nextLine();

        CarList carList = new CarList(fileName);

        // print all cars

        carList.printList();

        // print the oldest car

        Car oldestCar = carList.oldestCar();

        System.out.println("Oldest Car is : " + oldestCar.toString());

        // Count car with model

        int count = carList.countCarsWithModel("Mustang");

        System.out.println("Total number of cars with Mustang is " + count);

        // List of Antique cars

        ArrayList<Car> antiqueCar = carList.antiqueCarList();

        System.out.println("List of Antique Cars:");

        for (Car car : antiqueCar) {

            System.out.println(car.toString());

        }

        // list of expensive car

        carList.printExpensiveCar();

        sc.close();

    }

}

Screenshots of BlueJ

Feel free to comment for any doubts and give thumbs up!

Thank you!