Over the years, the book has been updated to keep pace with the evolving Java platform. The authors have released new editions, covering topics like Java 8, Java 11, and Java 14.

The book "Core Java" was first published in 1996 and has since become a standard reference for Java programmers. The authors, Cay Horstmann and Gary Cornell, are well-known experts in the field of computer science and programming.

As for Harikrishna, I couldn't find any information on a person with that name associated with the book "Core Java". It's possible that Harikrishna is an Indian author who wrote a different book on Java, or maybe there's a confusion with the actual authors.

The book covers the core concepts of Java programming, including object-oriented programming, Java syntax, data structures, and file I/O. It's designed for both beginners and experienced programmers who want to learn Java.

If you're interested in learning Java, "Core Java" is an excellent resource. You can find the book on online platforms like Amazon or Google Books, or download a PDF version (just be sure to check the copyright laws in your country).

Would you like to know more about the book or Java programming in general?