This chapter introduced the concept of functional programming. It provided an overview of the functional interfaces that come with JDK and demonstrated how to use them. It also discussed and demonstrated lambda expressions and how effectively they can improve code readability.
The next chapter will make the reader familiar with the powerful concept of datastreams processing. It explains what streams are, how to create them and process their elements, and how to build processing pipelines. It also shows how easily you can organize stream processing in parallel.
