Fluent interface is a pattern, which usually relies on method chaining. Fluent is a pattern for adding method cascading to languages that don't have it, and combining cascading with chaining. Or in the front-end world, jQuery is a good example. This construction is used quite often in frameworks which provide a fluent API. I’d like to stress that Fluent Interfaces are not just Method Chaining. 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. 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. 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. Some good examples in the Java world are jOOQ or Apache Camel. The Builder pattern is extremely popular in Java applications. posted on Fri, Jan 03 '20 under tag: code. So, the factory pattern is well suited in providing a fluent mechanism to build objects. Libraries promoting the fluent builder pattern. One of them is asserjJ that works very well with JUnit. Before Java 8, a nested fluent API was difficult to write as the following articles demonstrate (here, here, and here). 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. Firstly it follows fluent builder pattern and allows to apply one assertion at a time. If you're using tools that get flummoxed by setters that return values, Paulo's pattern … It’s often repeated among experienced software professionals that code is read FAR more than it is written. Fluent Interface Definition by Wikipedia. Certain design decisions in Java … Builder Pattern, Fluent Programming. In software engineering, a fluent interface (as first coined by Eric Evans and Martin Fowler) is an implementation of an object-oriented API … I also don't see the critique of builder, mutability/immutability is … That would probably be an Expression Builder then. Bad, Java! It’s important to understand that we’re not really changing any logic or behavior. The last method, build(), is a terminating method as it stops the fluent interface. In this post, I’ll use a Java library I recently open sourced to talk about both. But also the stream API of Java 8 follows this style. Fluent assertion pattern is supported by testing libraries. … 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). The result will be Fluent Page Objects or Fluent Page Object Pattern. I love fluent interfaces, and I love the builder pattern. 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