In this short chapter, we had a look at reactive programming, reactive systems, and reactive streams. We discussed the similarities and the differences between these that may lead to confusions. We paid special attention to Java 9 reactive streams that have practically nothing to do with Stream classes and methods.

In the second half of the chapter, we discussed a very simple example that uses reactive streams.

After reading this chapter, you have learned a lot about the Java language and programming. We did not detail all the small bits of Java, but that is not possible in a book. I dare say that there is no man (or woman for that matter) on the Earth or around it on an orbital route, wherever humans are, who knows everything about Java. We, however, know enough by now to start coding in an enterprise environment and to learn more and more on the go till we retire, or even after that. What is still left is a little bit of programming. In the previous sentence I said coding to make...