When I started my career, books with titles such as 'Teach Yourself C in 21 Days', and 'Learn Java in 7 Days' were pretty popular. I was impressed that people could read such books. I never thought I could learn a new language in such a small amount of time myself. Time has passed. I’ve come to realize that I’m not alone in that case. Those books just happen to stretch the definition of learning a new programming language - and I’m being polite.

Java is the first language that I learned and used professionally. It has been my bread and butter for about a decade and half years. And yet, it’s not the only language I’ve learned nor used in all my years: for example, a long time ago, I’ve had to develop JavaScript code to implement a dynamic user interface. At that time, it was called DHTML…​ A couple of years ago, I also taught myself Kotlin, and never stopped using it.