Class Flash ActionScript

class Car {
          
          private var speed:Number;
          private var direction:String;
          public function Car(speed,direction) {
               this.speed = speed;
               this.direction = direction;
          }
          public function showVelocity():void {
               trace("The car's velocity is "+this.speed+" KPH "+this.direction);
          }
          public function crash():void {
               trace("Boom!");
          }
     }