Java的二十三种设计模式（建造者模式（Builder））

public class Builder {
  private List<Sender> list = new ArrayList<Sender>();
  public void produceMailSender(int count){
    for(int i=0; i<count; i++){
      list.add(new MailSender());
    }
  }
  public void produceSmsSender(int count){
    for(int i=0; i<count; i++){
      list.add(new SmsSender());
    }
  }
}

public class Test {
  public static void main(String[] args) {
    Builder builder = new Builder();
    builder.produceMailSender(10);
  }
}