Question

CS1180 Lab 9 Students will learn how to create a user-defined class. Part 1. Create a user-defined class. 1. Follow the UML diagram below to create a user-defined class, Automobile When implementing the constructors, use the default value of 0 for numeric types and "unknown" for VehicleMake and VehicleModel when not given as a parameter Implement the toString method in a format ofyour choosing, as long as it clearly includes information for all four member variables Make sure to include Javadoc comments for each method of the class. Automobile -vehicleMake: String vehicleModel: String - num - estMPG: double berCylinders: int +Automobile 0 +Automobile (vehicleMake: String, vehicleModel : String) +Automobile (vehicleMake: String, vehicleModel : String, numberCylinders : int, estMPG: double) + setVehicleMake (String vehicleMake) : void + getVehicleMake O: String + setVehicleModel (String vehicleModel) void +getVehicleModel 0: String +setNumberCylinders ( numberCylinders : int): void +getNumberCylinders: int + setEstMPG(estMPG: double) void + getEstMPG ): double +toString0 String

Answer 1

PROGRAM CODE:

Automobile.java

package automobile;

/**

*

* @author your name

* Automobile class that talks about the make, model, cylinders and estimated MPG of a vehicle

*/

public class Automobile {

  

   private String vehicleMake;

   private String vehicleModel;

   private int numberCylinders;

   private double estMPG;

  

   /**

   * Constructor with two arguments - make and model

   * Default value for cylinders is 0

   * Default value for estimated MPG is 0

   * @param vehicleMake

   * @param vehicleModel

   */

   public Automobile(String vehicleMake, String vehicleModel) {

       this.vehicleMake = vehicleMake;

       this.vehicleModel = vehicleModel;

       this.numberCylinders = 0;

       this.estMPG = 0;

   }

  

   /**

   * Constructor with arguments for all the member variables

   * @param vehicleMake

   * @param vehicleModel

   * @param numberCylinders

   * @param estMPG

   */

   public Automobile(String vehicleMake, String vehicleModel, int numberCylinders, double estMPG) {

       this.vehicleMake = vehicleMake;

       this.vehicleModel = vehicleModel;

       this.numberCylinders = numberCylinders;

       this.estMPG = estMPG;

   }

  

   /**

   * Default constructor with default value of 'unknown' for make and model

   * Default value for cylinders is 0

   * Default value for estimated MPG is 0

   */

   public Automobile() {

       this.vehicleMake = "unknown";

       this.vehicleModel = "unknown";

       this.numberCylinders = 0;

       this.estMPG = 0;

   }

  

   /**

   *

   * @return make of the vehicle

   */

   public String getVehicleMake() {

       return vehicleMake;

   }

  

   /**

   * sets the make to the parameter

   * @param vehicleMake

   */

   public void setVehicleMake(String vehicleMake) {

       this.vehicleMake = vehicleMake;

   }

  

   /**

   *

   * @return model of the vehicle

   */

   public String getVehicleModel() {

       return vehicleModel;

   }

  

   /**

   * sets the model to the parameter

   * @param vehicleModel

   */

   public void setVehicleModel(String vehicleModel) {

       this.vehicleModel = vehicleModel;

   }

  

   /**

   *

   * @return number of cylinders

   */

   public int getNumberCylinders() {

       return numberCylinders;

   }

  

   /**

   * sets the number of cylinders to the parameter

   * @param numberCylinders

   */

   public void setNumberCylinders(int numberCylinders) {

       this.numberCylinders = numberCylinders;

   }

  

   /**

   *

   * @return estimated MPG

   */

   public double getEstMPG() {

       return estMPG;

   }

  

   /**

   * sets the estMPG to the parameter

   * @param estMPG

   */

   public void setEstMPG(double estMPG) {

       this.estMPG = estMPG;

   }

  

   /**

   * returns the vehicle information in one line

   */

   @Override

   public String toString() {

      

       return "Make: " + vehicleMake + ", Model: " + vehicleModel + ", Cylinders: " + numberCylinders + ", MPG: " + estMPG;

   }

}

AutomobileTester.java

package automobile;

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

//Tester class

public class AutomobileTester {

   /**

   * This method reads the automobile data from the file and adds then into the automobile array

   * @param filename - name of the file to be read

   * @return an array of automobiles

   */

   public static Automobile[] readFromFile(String filename)

   {

       Scanner fileReader;

       Automobile automobiles[] = null;

       try {

           fileReader = new Scanner(new File(filename));

           int numberOfAutomobiles = Integer.valueOf(fileReader.nextLine());

           automobiles = new Automobile[numberOfAutomobiles];

           for(int i=0; i<numberOfAutomobiles; i++)

           {

               Automobile automobile = new Automobile(fileReader.nextLine(), fileReader.nextLine(),

                       Integer.valueOf(fileReader.nextLine()), Double.valueOf(fileReader.nextLine()));

               automobiles[i] = automobile;

           }

           fileReader.close();

       } catch (FileNotFoundException e) {

           // TODO Auto-generated catch block

           e.printStackTrace();

       }

      

       return automobiles;

   }

  

   /**

   * this method displays all the vehicle information that matches the 'make'

   * @param automobiles - array of automobiles

   * @param make - the make of the vehicle that needs to be searched

   */

   public static void displayVehicles(Automobile automobiles[], String make)

   {

       System.out.println("\nMake\t\tModel\tNum of Cylinders Estimated MPG\n");

       for(int i=0; i<automobiles.length; i++)

       {

           if(automobiles[i].getVehicleMake().equalsIgnoreCase(make))

           {

               System.out.printf("%-10s\t%-10s\t%d\t\t%.1f\n", automobiles[i].getVehicleMake() , automobiles[i].getVehicleModel() ,

                       automobiles[i].getNumberCylinders() , automobiles[i].getEstMPG());

           }

       }

   }

  

   public static void main(String[] args) {

       //Part 1 of the assignment

       //creating separate vehicles

       Automobile vehicle1 = new Automobile();

       Automobile vehicle2 = new Automobile("Toyota", "Crysta");

       Automobile vehicle3 = new Automobile("Hyundai", "EON", 3, 62);

       //printing the vehicle information

       System.out.println(vehicle1);

       System.out.println(vehicle2);

       System.out.println(vehicle3);

      

       //using accessors and mutators

       vehicle1.setVehicleMake("Volkswagen");

       vehicle1.setVehicleMake("Polo");

       vehicle1.setNumberCylinders(4);

       vehicle1.setEstMPG(80.7);

      

       System.out.println("Make: " + vehicle1.getVehicleMake());

       System.out.println("Model: " + vehicle1.getVehicleModel());

       System.out.println("Cylinders: " + vehicle1.getNumberCylinders());

       System.out.println("MPG: " + vehicle1.getEstMPG());

      

       /*This is part 2 of assignment. Calling a function to read a file of automobiles and then searching only for

       a particular make and displaying all the vehicles of that particular make

       */

      

       Automobile automobiles[] = readFromFile("Lab9AutoData.txt");

       Scanner reader = new Scanner(System.in);

       String make = "";

       while(true)

       {

           System.out.print("\nEnter Make: ");

           make = reader.nextLine();

           if(make.equalsIgnoreCase("done"))

               break;

           else displayVehicles(automobiles, make);

              

       }

       reader.close();

   }

}

INPUT:

Automobile.java AutomobileTester.javaab9AutoData.txt 3 1 3 2 Volkswagen 3 Polo 5 80.7 6 Hyundai. 7 Etimos 8 3 9 62 10 Volkswagen 11 Beetle 12 3 13 67

OUTPUT:

DeclarationProblems SearchConsole 3 <terminated> AutomobileTester [Java Application] /Library Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/bin/java (31-Mar-20 Make: unknown, Model: unknown, Cylinders: 0, MPG: 0.0 Make: Toyota, Model: Crysta, Cylinders: 0, MPG: 0.0 Make: Hyundai, Model: EON, Cylinders: 3, MPG: 62.0 Make: Polo Model: unknown Cylinders: 4 MPG: 80.7 Enter Make: volkswagen Make Model Num of Cylinders Estimated MPG Volkswagen Volkswagen Polo Beetle 80.7 67.0 4 Enter Make: done