This is a very good course in german.
The course covers the very basics, the foundation for every programmer.
I used it as a refresher course, but did learn a few new things as well.
The course is nicely structured, the videos are quite good, and the examples easy to understand.
What makes this course stand out is the platform "Code Ocean" that is used for exercises. After most videos there are 3 exercises in 3 different levels of difficulty. The programming exercises get tested against JUnit tests and verified. This is immensely helpful to make sure, that the small programs are running fine!
I would definitely recommend this course to anyone who wants to start programming in Java and is fluent in German.