Java Java Design pattern (4): Builder mode (builder)

The factory class pattern provides the pattern of creating a single class, while the builder pattern is to centralize the various products to manage, to create composite objects, so-called composite objects that refer to a class that has different properties, in fact the builder pattern is the combination of the previous abstract factory pattern and the last Test. Let's look at the code:

As before, a sender interface, two implementation classes MailSender and Smssender. Finally, the Builder class is as follows:

 Public classBuilder {Privatelist<sender> list =NewArraylist<sender>();  Public voidProducemailsender (intcount) {           for(inti=0; i<count; i++) {List.add (NewMailSender ()); }      }             Public voidProducesmssender (intcount) {           for(inti=0; i<count; i++) {List.add (NewSmssender ()); }      }  }  

Test:

 Public class Test {        publicstaticvoid  main (string[] args) {          new Builder ();          Builder.producemailsender (ten);      }  }  

From this point of view, the builder pattern integrates many functions into a class that can create more complex things. So the difference with the engineering model is that the factory model is concerned with creating a single product, while the builder pattern is concerned with creating a conforming object, multiple parts. Therefore, the choice of the factory model or the builder model depends on the actual situation.

Java Java Design pattern (4): Builder mode (builder)