dart继承（extends）和mixins结合使用

代码：

class Person {
  String name;
  int age;
  Person(this.name, this.age);
  void printInfo() {
    print('name:${this.name}---age:${this.age}');
  }
}

class A {
  String info = 'this is A';
  void printA() {
    print('A');
  }
}

class B {
  int num = 20;
  void printB() {
    print('B');
  }
}

class C extends Person with A, B {
  C(String name, int age) : super(name, age);
}

void main(List<String> args) {
  var c = new C('jack', 22);
  var n = c.info;
  print(n);
  c.printInfo();
  c.printA();
  c.printB();
  print(c.name);
  print(c.age);
}

输出结果：

this is A
name:jack---age:22
A
B
jack
22