public class Client {
  public static void main(String[] args) {
    Director director = new Director();

    Builder b1 = new ConcreteBuilder1();
    Builder b2 = new ConcreteBuilder2();

    director.constract(b1);
    Product p1 = b1.getResult();
    p1.show();

    director.constract(b2);
    Product p2 = b2.getResult();
    p2.show();
  }
}