Kotlin for Java Developers (Udemy.com)

The course is in principle good. But many lessons are old, deprecated and sometimes simply not available anymore. For example REPL does not exist in IntelliJ IDEA anymore (was replaced by Scratch/Notebook). The toUpperCase() on Strings is an error since Kotlin 2.1 ... until this course is updated I can not really recommend it. Additionally it is a bit slow and repetitive. Especially when you already know and have some years developing in Java. I think this course is more tailored for Java Beginners.

I'm already having intermediate knowledge of the Java Programming Language. So, I find this course very good and easy to understand. Many concepts are very different to Java, and as I write more and more Kotlin code, I think Kotlin is more fluent and modern than Java. I also see that it is very flexible (concise) as compared to Java. The only thing that worries me is that the lectures in these courses were recorded in 2017, and I am watching them in 2025. So I think there are more new Kotlin features that you don't find in the course. But, I think this is fine because as you learn initial Kotlin, you can quickly adapt to new features.

The course is taught by Sarah Ettridge who understands the Kotlin functionality really well. The course is slightly outdated and some references are made to Java not having certain functionality where ATM Java actually has caught up. Still though it's a great way for a Java developer to become familiar with Kotlin. The course is lacking an end summary at each session, perhaps a downloadable slide with the core lessons from each session. I created it myself but suspect most did to capture the core lessons.

The lecturer is knowledgeable and explains topics well with examples. They also speak in an uplifting manner, making it enjoyable to come back and learn more. However, I found myself missing some slides with explanations. As English is not my native language, I had to backtrack and listen to some parts multiple times to ensure I had gathered all the information. Having text on the screen would have been helpful to take the time to learn about it thoroughly and avoid any doubts about missing information.

The teacher explains VERY!! well, she emphasizes the important things very well, the examples are very good for understanding the concepts, she speaks very clear english (very important when you aren't a native english speaker). So I learnt and enjoy a lot with this course :) I really recommend it.

As a long time java developer who has been interested in Kotlin this was exactly what I needed. Covered all the core topics of interest and made it easy for me to quickly progress through the course. highly recommended for any current Java developers who want to get up to speed quickly on Kotlin.

Great course for Java developers transitioning to Kotlin. I believe even developers coming from other languages besides Java can definitely benefit from taking this course. I do wish there were more structured opportunities to apply all the concepts covered. I was hoping for small and simple applications as opposed to the coding challenges. Nonetheless an awesome course!

Great course. Totally was worth my investment of money and time. I do know a bit of java and this was a great course for me. Teacher is excellent and brings it down to earth so that it is clear to understand. I personally do like when teachers provide some very simple examples to learn a complex programming tools because it demystifies a lot of "magic" you would believe exists otherwise. I cannot say that i am now 100% ready to code in Kotlin but, i can reference this course few more times to get what i need when i need it. I would say this was great learning journey. Thank you!

First of all, thank you for this amazing course ! It really help me to learn kotlin from scratch. This will help me improve my skills as kotlin is becoming more popular specially in android. I really recommend this to anyone who wants to learn kotlin in general or anyone who wants to use kotlin with android.

I love Sarah's style, just clear, to the point, yet makes the lecture fun to watch. She is also quite succinct. This is my very first Udemy class, I like it, especially love the end of chapter exercises. That's why I'm asking if Sarah can add a few more. Even better, if there's a small java project like the adventure game that student can use for conversion at the end of the course, then Sarah would explain her way of doing this conversion would serve as an overall review of the course material. But I'm been picky here, this is an excellent course, already helping me work on my first kotlin app at work. Wonderful instructor, great material.