Too Long; Didn't Read
A better programmer is always a better Java developer and that’s why all the tips I have shared before to improve your programming skill and become a better programmer still holds true. These tips are equally useful for both Core Java developer, I mean Java guys who write server-side applications but not really involved with web development skills e.g. JSP, Servlet, and JEE, as well as Java Web developer whose primary job is to write web applications using Java technology. I know many programmers who have not written a single line of code using Java 8 features like lambdas and Stream API.