Question

Java Program

Write a class named Car that has the following fields:

• yearModel- The yearModel field is an int that holds the car’s year model.
• make- The make field is a String object that holds the make of the car, such as “Ford”, “Chevrolet”, etc.
• speed- This speed field is an int that holds the car’s current speed.

In addition, the class should have the following methods:

• Constructor- The constructor should accept the car’s year model and make as arguments. These values should be assigned to the object’s yearModel and make fields. The constructor should also assign 0 to the speed field.
• Accessor- The appropriate accessor methods get the values stored in an object’s yearModel, make, and speed fields.
• accelerate- The accelerate method should add 5 to the speed field each time it is called.
• decelerate- The decelerate method should decrease the speed field by 8 each time it is called.

CarApp class:

Write a CarApp class that does the following:

1. Create a Car object using the values 2010 for yearModel and “Ford” for make.
2. Call the accelerate method five times and increase the speed by five each time.
3. After each acceleration, retrieve and display the speed.
4. Call the decelerate method three times and decrease the speed by 8 each time.
5. After each deceleration, retrieve and display the speed.

Sample run:

Current speed: 5

Current speed: 10

Current speed: 15

Current speed: 20

Current speed: 25

Current speed: 17

Current speed: 9

Current speed: 1

Answer 1

class Car {

    private int yearModel;
    private String make;
    private int speed;

    public Car(int yearModel, String make) {
        this.yearModel = yearModel;
        this.make = make;
        speed = 0;
    }

    public int getYearModel() {
        return yearModel;
    }

    public String getMake() {
        return make;
    }

    public int getSpeed() {
        return speed;
    }

    public void accelerate() {
        speed += 5;
    }

    public void brake() {
        speed -= 8;
    }
}

class TestCar {
    public static void main(String[] args) throws IllegalArgumentException {
        Car car = new Car(2018, "Ferrari");
        for (int i = 0; i < 5; i++) {
            car.accelerate();
            System.out.println("Current speed: " + car.getSpeed());
        }
        for (int i = 0; i < 3; i++) {
            car.brake();
            System.out.println("Current speed: " + car.getSpeed());
        }
    }
}