Class

readme.md

Class

Created with <3 with dartpad.dev.

main.dart

class Product {
  //Khai báo các thuộc tính
  String manufacture = '';
  String name = '';
  var price;
  int quantity = 100;

  //Khai báo hàm khởi tạo
  Product(var price, int quantity) {
    this.price = price;
    this.quantity = quantity;
    print("Product");
  }

  //Khai báo các phương thức
  calulateTotal() {
    return this.price * this.quantity;
  }

  showTotal() {
    var tong = this.calulateTotal();
    print("Tổng số tiền là: $tong");
  }
}

class productVip extends Product {
  String? account;
  String? password;

  productVip(this.account, this.password) : super("100", 100);

  void check() {
    print("productVip");
    print("==>${account},${password}");
  }
}

//--------------2----------
class Person {
  String? firstName;
  void test() {
    print("test!!!");
  }
}

class Employee extends Person {
  Employee(Map data) {
    print('in Employee');
  }
}

void main() {
//   List bar = [];
//   bar[0] = 1;
  List<int> myList1 = [1, 2, 3];
  myList1[0] = 4; // myList = [1,2,4]
  myList1.forEach(print);

//   final product1 = new productVip("a", "b").showTotal();

  final product1 = new productVip("", "");
  product1.account = "a";
  product1.password = "b";

  product1.check();

  //---------------------
//   final product1 = new productVip()
//     ..account = "a"
//     ..password = "b";

  //-------------------2---------------------
  var emp = new Employee({});
  emp.test();
}