What is the difference between builder and factory

Example 1 : There is a CarBuilder, which builds a car by building its transmission system, engine, wheels, etc. There is no relation between a car and a bike, but both the builders may use the same vendors to procure parts like nuts and bolts and hence may extend the same abstract class VehicleBuilder.

Both builders will now have to build different objects, and they may not have the same parts. The veg meal still has a main, a side, and, a drink.

The non-veg meal has a salad, a main, and a dessert. VegMealBuilder will prepare Mac-n-cheese, enchilada soup and soy milk for the veg meal. NonVegMealBuilder will give you mexican salad, chicken burger and pudding.

Watch closely how it makes an ordinaryGame vs magicGame objects which both will eventually inherit from MazeGame. Like a real Factory, the task it does is just to construct objects.

Here is the example from his book:. With the builder, it would be possible to do a chain-call, like new NutritionFacts. Builder , 8. Let me just give you an example that will say everything about what I just said. I recently came across a class with inheritance where I wanted to have the builder relationship. Also, keep in mind that is a good idea to depend on interfaces and not on concrete implementations.

Design Patterns in Java: Singleton. Design Patterns Microservices. Strategy vs. Factory Design Patterns in Java. See the original article here.

Thanks for visiting DZone today,. Edit Profile. Sign Out View Profile. Over 2 million developers have joined DZone. The Builder and Factory design patters, what they are, where to use them, how to make them with code samples and what are their differences. The builder pattern allows for this finer granularity. Python Javascript Linux Cheat sheet Contact. What is the difference between Builder Design pattern and Factory Design pattern? From Wikipedia: Builder focuses on constructing a complex object step by step.

Abstract Factory emphasizes a family of product objects either simple or complex. Builder returns the product as a final step, but as far as the Abstract Factory is concerned, the product gets returned immediately. Builder often builds a Composite.