So, the factory pattern is well suited in providing a fluent mechanism to build objects. Some good examples in the Java world are jOOQ or Apache Camel. I love fluent interfaces, and I love the builder pattern. Before Java 8, a nested fluent API was difficult to write as the following articles demonstrate (here, here, and here). I’d like to stress that Fluent Interfaces are not just Method Chaining. In this post, I’ll use a Java library I recently open sourced to talk about both. I also don't see the critique of builder, mutability/immutability is … It’s important to understand that we’re not really changing any logic or behavior. Or in the front-end world, jQuery is a good example. … Certain design decisions in Java … Fluent assertion pattern is supported by testing libraries. In this post on learning Java (and OOP) as a functional programming person, I look at the builder pattern, what problem it solves, and why it may be that way. Typically, we could use a minimal example: In the JDK you can find the Calendar#getInstance() method that is similar to the previous example, among others. Fluent Interface. Fluent interface is a pattern, which usually relies on method chaining. The last method, build(), is a terminating method as it stops the fluent interface. Bad, Java! It’s often repeated among experienced software professionals that code is read FAR more than it is written. Builder Pattern, Fluent Programming. Continuing on the example of the previous section, we’re trying to make our builder code better readable by applying a fluent interface to it. Fluent Interface Definition by Wikipedia. The Builder pattern is extremely popular in Java applications. The result will be Fluent Page Objects or Fluent Page Object Pattern. In software engineering, a fluent interface (as first coined by Eric Evans and Martin Fowler) is an implementation of an object-oriented API … Introduction. Firstly it follows fluent builder pattern and allows to apply one assertion at a time. You can certainly put a Fluent Interface on top of a Director/Builder pattern to make it read more – well – fluently and to emphasize the domain concepts (vs. the technical process of building and delegating). But also the stream API of Java 8 follows this style. Libraries promoting the fluent builder pattern. Paulo Abrantes offers another way to make JavaBean setters fluent: define an inner builder class for each JavaBean. That would probably be an Expression Builder then. With Java 8 and the ability to pass a functional interface we can take a crack at another approach to building a nested fluent API. Further – in case of test failure – it facilitates writing one detailed message. Fluent is a pattern for adding method cascading to languages that don't have it, and combining cascading with chaining. This construction is used quite often in frameworks which provide a fluent API. 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