Flutter勉強会3回目の資料(クラス)

flutter_study_3rd_1.dart

void main() {
  // instance
  Sample sample = Sample('Hello Dart World!');
    
  sample.speakPublicMessage();
  
  sample.setPrivateMessage('Goodbye Native World.');
  sample.speakPrivateMessage();
}

// classの定義
class Sample {
  // constructor
  Sample(this.publicMessage);

  // public field
  String publicMessage;
  
  // private field
  String _privateMessage;

  // method
  void setPrivateMessage(String newValue) => _privateMessage = newValue;

  void speakPublicMessage() {
    print(publicMessage);
  }

  void speakPrivateMessage() {
    print(_privateMessage);
  }
}