第14章Mixin混入-mixin_object_type

 

//mixin_object_type.dart文件
//類A
class A {

  //同名方法A
  String getMessage() => 'A';

}

//類B
class B {

  //同名方法 返回B
  String getMessage() => 'B';

}

//類P
class P {

  //同名方法 返回P
  String getMessage() => 'P';

}

//類AB 繼承P 先混入A類後混入B類
class AB extends P with A, B {

}

//類BA 繼承P 先混入B類後混入A類
class BA extends P with B, A {

}

void main() {
  //實例化AB類
  AB ab = AB();
  print(ab is P);  //true
  print(ab is A);  //true
  print(ab is B);  //true

  //實例化BA類
  BA ba = BA();
  print(ba is P);  //true
  print(ba is A);  //true
  print(ba is B);  //true

}

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