子类继承多个父类总结

class Eat {
  void eat() {
    print('吃');
  }
}

class Sleep {
  void sleep() {
    print('睡');
  }
}

class Person with Eat, Sleep {
  int age;
  String name;
  Person(this.name, this.age);
  void sayhi() {
    print('hello');
  }

  void printInfo() {
    print('姓名：${this.name}-----年龄：${this.age}');
  }
}

void main(List<String> args) {
  Person p = new Person('jack', 20);

  print(p.name);

  print(p.age);

  p.eat();

  p.sleep();

  p.sayhi();

  p.printInfo();
}

输出结果：
jack
20
吃
睡
hello
姓名：jack-----年龄：20