I thank you for your contribution. Here are my thoughts;
Contributions on Utopian must be open source and contain correct repository from GitHub. This one does not contain a repository. As there is no official repository for Java, you can include whitelisted unofficial repository for it. You can find whitelisted repositories on the guidelines page.
Main purpose of the tutorial is to teach the user something unique, not to show ubiquitous functions and replicate well-documented concepts. What you've shown here can easily be found on the internet, with great quality. So, what I suggest is changing the topic or increasing both the quality and the volume of the tutorial to provide a better alternative to those ones over the internet.
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Thank you for your review, @yokunjon!
So far this week you've reviewed 2 contributions. Keep up the good work!