Real-world examples of the Builder pattern

问题

I would like to see how is Builder pattern used in real world applications/APIs. The examples I found are all pizzas, cakes, cars et cetera (plus the parser example from the GoF book).

Could you please tell me about some usages of this patten in real-world applications/APIs, preferably from the world of C++, .NET or PHP (as those are the languages I'm familiar with).

Thanks.

回答1:

Update: I recently came across an even better example (imo). Checkout the JobBuilder and TriggerBuilder implementations in the Quartz scheduler package: http://quartz-scheduler.org/api/2.1.5/

Also, when I have time, just for fun/practice, I try to write examples of all GoF patterns in java. Just recently, I used the Builder pattern to make it easy to generate different types of Sitemaps (google site map vs, html site map, etc). The code is in java, but you might be useful: https://github.com/dparoulek/java-koans/tree/master/src/main/java/com/upgradingdave/koans/builder

Good question, I'd be interested in seeing more modern examples too.

回答2:

Builder pattern is used in javax.json.Json and javax.json.JsonBuilder classes while building Json objects.

Good explanation is at http://www.programcreek.com/java-api-examples/index.php?api=javax.json.JsonObjectBuilder and also check out its official documentation.

JsonObjectBuilder b = Json.createObjectBuilder().
            add( "report", Json.createObjectBuilder().
                 add( "reportId", reportId ).
                 add( "title", title ).
                 add( "subtitle", subTitle == null ? "" : subTitle ).
                 add( "created", created.toString() ).
                 add( "description", description == null ? "" : description ).
                 add( "data", report )
            );
return b.build();

来源：https://stackoverflow.com/questions/5211039/real-world-examples-of-the-builder-pattern

标签

design-patterns

builder