package class4_1_Observer; // MSOE. Dr. Yoder. 06 January 2016.

public class VelocityObserver implements PositionObserver {
    private double oldPosition;

    /**
     * Computes & displays the velocity.
     *
     * This method will automatically be called each second.
     * (A more general solution would include the time-stamp.)
     *
     * @param positionMeters the current position, in meters
     */
    @Override
    public void update(double positionMeters) {
        // Compute velocity
        double  velocity = positionMeters - oldPosition;
        oldPosition = positionMeters;
        System.out.println("Velocity: "+velocity+" m/s");

    }
}