Four builder patterns for Java design Patterns (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:

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2. public class Builder {
6. Private list<sender> List = new arraylist<sender> ();
10. public void Producemailsender (int count) {
12. for (int i=0; i<count; i++) {
14. List.add (New MailSender ());
16. }
18. }
22. public void Producesmssender (int count) {
24. for (int i=0; i<count; i++) {
26. List.add (New Smssender ());
28. }
30. }
32. }

Test class:

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1. public class Test {
3. public static void Main (string[] args) {
4. Builder builder = new Builder ();
5. Builder.producemailsender (10);
6. }
7. }

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.

Four builder patterns for Java design Patterns (builder)