bicycle.dart

bicy.dart

class Bicycle {

  int cadence;

  int _speed = 0;

  int get speed => _speed;

  int gear;

  

  Bicycle(int cadence, int gear) {

    this.cadence = cadence;

    this.gear = gear;

  }

  

  void applyBrake(int decrement) {

    _speed -= decrement;

  }

  

  void speedUp(int increment) {

    _speed += increment;

  }

  

  @override

  String toString() => 'Bicycle: $speed mph';

  

}

​

void main() {

  var bike = new Bicycle(0, 1);

  print(bike);

}