Builder pattern (Builder)
The factory class mode provides a mode for creating a single class, while the builder mode is to centralize various products for management and use to create composite objects. The so-called composite object refers to a class with different attributes. In fact, the builder mode It is obtained by combining the previous abstract factory pattern and the final Test.
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());
}
}
}
From this point of view, the builder pattern integrates many functions into a class, which can create more complex things. So the difference with the engineering pattern is: the factory pattern is concerned with creating a single product, while the builder pattern is concerned with creating conforming objects, multiple parts. Therefore, whether to choose the factory mode or the builder mode depends on the actual situation.