Question

1. Create a Java class file for a Car class.
   1. In the File menu select New File...
   2. Under Categories: make sure that Java is selected.
   3. Under File Types: make sure that Java Class is selected.
   4. Click Next.
   5. For Class Name: type Car.
   6. For Package: select csci2011.lab7.
   7. Click Finish.
   8. A text editor window should pop up with the following source code (except with your actual name):

1. 16. csci1011.lab7;
       
       /**
       *
       * @author Your Name
       */
       public class Car {
       
       }
2. Implement the Car class.
   1. Add the following private instance variables to the Car class:
      • An instance variable called model of type String.
      • An instance variable called color of type String.
      • An instance variable called year of type int.
      • An instance variable called currentSpeed of type double
   2. Add the following methods to the Car class:
      • A void method called initialize that takes two Strings, an int and a double as arguments, and uses those arguments to set the values of the model, color, year, and currentSpeed instance variables.
      • A void method called display that displays the model, color, year followed by the currentSpeed in parentheses. For example, if the model of the car is Ford, the color is Red, the year is 2018, and the current speed is 43 mph it should display Ford, Red, 2019 (43 mph).
   3. In the main method of your main class, create two Car objects and perform the following:
      • Initialize the car objects with a model, color, year, and current Speed of your choice, and display then. Your output might look like this:
   54. and display:
       Ford, Red, 2019 (43 mph)
   • • For each instance variable change the value, then use the display method to make sure that the value changed.
   • Run the main program to see if the tests were successful.
     • Here is a sample output of the program.

1. 1. 54. and display:
      55. Red, 2018 (43.0)

1. 1. 3. Car's features
      4. Green, 2017 (43.0)

1. 1. 54. and display:
      55. Yellow, 2019 (50.0)

1. 1. 3. Car's features

1. 1. 1. Purple, 2015 (70.0)

Answer 1

/***********************************Car.java******************************/

public class Car {

   /*
   * private instance variable
   */
   private String model;
   private String color;
   private int year;
   private double currentSpeed;

   /*
   * Default constructor
   */
   Car() {

       this.model = "";
       this.color = "";
       this.year = 2000;
       this.currentSpeed = 0.0;
   }

   /*
   * Parameterized constructor
   */
   public Car(String model, String color, int year, double currentSpeed) {
       this.model = model;
       this.color = color;
       this.year = year;
       this.currentSpeed = currentSpeed;
   }

   // getter and setter method for get and set the instance variables
   public String getModel() {
       return model;
   }

   public void setModel(String model) {
       this.model = model;
   }

   public String getColor() {
       return color;
   }

   public void setColor(String color) {
       this.color = color;
   }

   public int getYear() {
       return year;
   }

   public void setYear(int year) {
       this.year = year;
   }

   public double getCurrentSpeed() {
       return currentSpeed;
   }

   public void setCurrentSpeed(double currentSpeed) {
       this.currentSpeed = currentSpeed;
   }

   // display method
   public void display() {

       System.out.println(model + ", " + color + ", " + year + "(" + currentSpeed + ")");
   }

}
/*******************************TestCar.java********************************/

public class TestCar {

   public static void main(String[] args) {

       //instantiate a car object
       Car car = new Car("Ford", "Red", 2019, 43.0);

       //display car
       car.display();

       //modification in car's features
       car.setYear(2018);
       System.out.println("Car's features");
       car.display();

       car.setColor("Green");
       car.setYear(2017);
       System.out.println("Car's features");
       car.display();

       car.setColor("YELLOW");
       car.setYear(2019);
       car.setCurrentSpeed(50.0);
       System.out.println("Car's features");
       car.display();

       car.setColor("Purple");
       car.setYear(2015);
       car.setCurrentSpeed(70.0);
       System.out.println("Car's features");
       car.display();

   }
}
/***********************************output************************/

Ford, Red, 2019(43.0)
Car's features
Ford, Red, 2018(43.0)
Car's features
Ford, Green, 2017(43.0)
Car's features
Ford, YELLOW, 2019(50.0)
Car's features
Ford, Purple, 2015(70.0)

Please let me know if you have any doubt or modify the answer, Thanks :)