Going in this direction is a good choice. Being a Java developer and becoming a senior is a profession that will pay well in the coming 10 to 20 years and perhaps even longer. At the same time, I personally find this technology fascinating and interesting, and after more than 10 years of Java programming and more than 35 years of programming, I still learn something new every day.
In this book, you learned the basics of Java programming. I also mentioned issues, suggested directions, and warned you about pitfalls that are not Java specific. However, we also did the homework of learning about the Java language, the infrastructure, the libraries, development tools, and networking in Java. You also learned about the most modern approaches that come only with Java 8 and 9, such as functional programming in Java, streams, and reactive programming. Now you can start working...
