Design Patterns: Builder Pattern

 From the Definition, “Separate the construction of a complex object from its representation so that the same construction process can create different representations.” Builder pattern builds a product and it needs a direction with the help of a concrete building.

From the Quartz scheduler, we can find real-time examples like JobBuilder, TriggerBuilder, DateBuilder, etc., which can be found here Quartz Scheduler. 

In springboot you can find builder pattern in multiple places.

Example:  

    interface DocumentBuilder{

        void addTitle();

        void addParagraph();

    }

void createDocument(DocumentBuilder dBuilder) {
  dBuilder.addTitle("Builder pattern application..");
  dBuilder.addParagraph("Is the Builder Pattern restricted...");
  dBuilder.addParagraph("The builder pattern implementation ...");
}

  class WordDocumentBuilder implements DocumentBuilder {

   ..........

  WordDocument getResult();
}

WordDocumentBuilder b = new WordDocumentBuilder();
createDocument(b);
WordDocument dom = b.getResult();

We can build any kind of document by creating a concrete object to each product.