Question

Creating Enumerations In this section, you create two enumerations that hold colors and car model types. You will use them as field types in a Car class and write a demonstration program that shows how the enumerations are used.

1. Open a new file in your text editor, and type the following Color enumeration: enum Color {BLACK, BLUE, GREEN, RED, WHITE, YELLOW};

2. Save the file as Color.java.

3. Open a new file in your text editor, and create the following Model enumeration: enum Model {SEDAN, CONVERTIBLE, MINIVAN};

4. Save the file as Model.java. Next, open a new file in your text editor, and start to define a Car class that holds three fields: a year, a model, and a color.

public class Car {

private int year;

private Model model;

private Color color;

5. Add a constructor for the Car class that accepts parameters that hold the values for year, model, and color as follows:

public Car(int yr, Model m, Color c) {

year = yr;

model = m;

color = c;

}

6. Add a display() method that displays a Car object’s data, then add a closing curly brace for the class.

public void display() {

System.out.println("Car is a " + year + " " + color + " " + model);

}

}

7. Save the file as Car.java.

8. Open a new file in your text editor, and write a short demonstration program that instantiates two Car objects and assigns values to them using enumeration values for the models and colors.

public class CarDemo {

public static void main(String[] args) {

Car firstCar = new Car(2014, Model.MINIVAN, Color.BLUE);

Car secondcar = new Car(2017, Model.CONVERTIBLE, Color.RED);

firstCar.display();

secondcar.display();

}

}

9. Save the file as CarDemo.java, and then compile and execute it.

the output should be something like

"Car is a 2014 BLUE MINIVAN

Car is a 2017 RED CONVERTIBLE"

in Java

Answer 1

Note: Make sure all the files are in same folder and has name as mentioned(Don't change any file name) there has to be total 4 java files which are given below.

CarDemo.java Code:

public class CarDemo
{
        public static void main(String[] args) {
        Car firstCar = new Car(2014, Model.MINIVAN, Color.BLUE);
    Car secondcar = new Car(2017, Model.CONVERTIBLE, Color.RED);
    firstCar.display();
    secondcar.display();
    
        }
}

Car.java Code:

public class Car{
    int year;
    Model model;
    Color color;
    public Car(int yr, Model m, Color c) {
    year = yr;
    model = m;
    color = c;
}
public void display() {

    System.out.println("Car is a " + year + " " + color + " " + model);

    }
}

Model.java Code:

enum Model {SEDAN, CONVERTIBLE, MINIVAN};

Color.java Code:

enum Color {BLACK, BLUE, GREEN, RED, WHITE, YELLOW};

Output:

Car is a 2014 BLUE MINIVAN
Car is a 2017 RED CONVERTIBLE