Question

Create a race between 3 cars in which they have different speed limits such as 20 mph, 60mph or 30. Respectively. the acceleration should be 15f/s or 10.23mph the race should be 3 tracks each of 1 mile long create instances for the 3 cars on the course and print out their speed, location and the time every 30 seconds

In java

Answer 1

Hi, please find the solution. I am incrementing the speed every second, according to the acceleration.

Feel free to make changes as required. Solution is working great.

public class Car {
    private float speedLimit;
    private float distanceTravelled=0;
    private float speed;

    public float getSpeedLimit() {
        return speedLimit;
    }

    public void addSpeed(float speed){
        if(this.speed+speed>speedLimit) return;//cannot go beyond speed limit
        this.speed += speed;
    }

    public float getSpeed() {
        return speed;
    }

    /**
     * Makes the car travel with that speed
     */
    public void travel(){
        distanceTravelled+= speed;
    }

    public float getDistanceTravelled(){
        return distanceTravelled;
    }
    public Car(float speedLimit) {
        this.speedLimit = speedLimit;
    }
}

import java.time.LocalDateTime;

public class Main {
    public static void main(String[] args) throws InterruptedException{
        float acceleration = 10.23f/(60f*60f);//miles per sec, assuming acceleration is same for all


        /*the above speed gets added every second*/
        Car a = new Car(20f/(60f*60f));
        Car b = new Car(60/(60f*60f));
        Car c = new Car(30/(60f*60f));
        System.out.println("a's speed limit is "+a.getSpeedLimit());
        System.out.println("B's speed limit is "+b.getSpeedLimit());
        System.out.println("C's speed limit is "+c.getSpeedLimit());
        LocalDateTime localDateTime = LocalDateTime.now();
        int i = 0;
        while(true){
        


            /*we need to add speed every second by acceleration amount*/
            if(a.getDistanceTravelled()<1)
            a.addSpeed(acceleration);
            if(b.getDistanceTravelled()<1)
            b.addSpeed(acceleration);
            if(c.getDistanceTravelled()<1)
            c.addSpeed(acceleration);
            a.travel();b.travel();c.travel();
            System.out.println("A Travelled "+a.getDistanceTravelled()+ " Distance & speed is "+a.getSpeed());
            System.out.println("B Travelled "+b.getDistanceTravelled()+ " Distance & speed is "+b.getSpeed());
            System.out.println("C Travelled "+c.getDistanceTravelled()+ " Distance & speed is "+c.getSpeed());
            System.out.println();
            System.out.println();
            if(a.getDistanceTravelled()>1 && b.getDistanceTravelled()>1 && c.getDistanceTravelled()>1) break;
            Thread.sleep(1000);//wait for a sec before runnning again.
        }


    }
}

A Travelled 0.10514166 Distance & speed is 0.0028416666 B Travelled 0.4972919 Distance & speed is 0.014208333 C Travelled 0.20744166 Distance & speed is 0.005683333 A Travelled 0.10798333 Distance & speed is 0.0028416666 B Travelled 0.51150024 Distance & speed is 0.014208333 C Travelled 0.21312499 Distance & speed is 0.005683333 A Travelled 0.110824995 Distance & speed is 0.0028416666 B Travelled 0.52570856 Distance & speed is 0.014208333 C Travelled 0.21880832 Distance & speed is 0.005683333