[Dart] Chained Methods with Mixin

main.dart

abstract class System {
  System() {
    initialize();
  }
  
  void initialize() {
    print('System boot start...');
  }
}

mixin Disk on System {
  static Disk get instance => _instance;
  static Disk _instance = null;

  @override
  void initialize() {
    super.initialize();
    
    _instance = this;
    print('Disk initializing now');
  }
  
  void capacity() {
    print('Disk ---> 40GB');
  }
}

mixin Processor on System {
  static Processor get instance => _instance;
  static Processor _instance = null;
  
  @override
  void initialize() {
    super.initialize();
    
    _instance = this;
    print('Processor initializing now');
  }
  
  void cores() {
    print('Processor ---> 4 cores');
  }
}

class Linux extends System with Processor, Disk {
}

void main() {
  Linux();
  Disk.instance.capacity();
  Processor.instance.cores();
  
  print(Disk.instance.runtimeType);
  print(Processor.instance.runtimeType);
}

不错，有点像组合/匿名字段/实现/继承。