Question

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. • speed: The 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 should be implemented to access the values stored in the object's yearModel, make, and speed fields. • accelerate: The accelerate method should add 5 to the speed field when it is called. • brake: The brake method should subtract 5 from the speed field each time it is called. Demonstrate the class in a program that contains a Car object, and then calls the accelerate method five times. After each call to the accelerate method, get the current speed of the car and print it on a separate line. Then, call the brake method five times, each time printing the current speed of the car on a separate line.

Sample Run

java Car

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Answer 1

Code is Given Below:

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Car.java

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public class Car {
   //declaring variables
   private int yearModel;
   private String make;
   private int speed;
   //parameter constructor
   public Car(int yearModel, String make) {
       super();
       this.yearModel = yearModel;
       this.make = make;
       this.speed = 0;
   }
   //Accessor: methods
   public int getYearModel() {
       return yearModel;
   }
   public String getMake() {
       return make;
   }
   public int getSpeed() {
       return speed;
   }
   //accelerate method that will increase speed by 5
   public void accelerate() {
       speed=speed+5;
   }
   //accelerate method that will decrease speed by 5
   public void brake() {
       speed=speed-5;
   }
  

}

test class

CarDriver.java

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public class CarDriver {
   public static void main(String[] args) {
       //creating car object
       Car c=new Car(2018,"Toyota");
       //calling accelerate 5 times and printing speed each time
       for(int i=1;i<=5;i++) {
           c.accelerate();
           System.out.println(c.getSpeed());
       }
      
       //calling brake 5 times and printing speed each time
       for(int i=1;i<=5;i++) {
           c.brake();
           System.out.println(c.getSpeed());
       }
      
   }

}

Output

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Code Snapshot:

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