Intro to Dart for Java Developers Codelab: Simple Dart Class

bicycle.dart

class Bicycle {
  int cadence;
  int _speed = 0;
  int gear;

  Bicycle(this.cadence, this.gear);

  int get speed => _speed;

  void applyBrake(int decrement) => _speed -= decrement;

  void speedUp(int increment) => _speed += increment;

  @override
  String toString() => "Bicycle: $_speed mph";
}

void main() {
  var bike = new Bicycle(2, 3);
  print(bike);
}

Execute: https://dartpad.dartlang.org/84a8977fa3727eaa55f7c4897a0f4b17