What will be the output of this code?

What will be the output of this code?

class Receiver {
  void action() { print('Action performed'); }
}

class ConcreteCommand implements Command {
  Receiver receiver;
  ConcreteCommand(this.receiver);
  void execute() { receiver.action(); }
}

void main() {
  Receiver r = Receiver();
  Command c = ConcreteCommand(r);
  c.execute();
  c.execute();
}