I don't use it for Java but I use it for PHP and it's pretty awesome. Even though we call it an editor, it has all plugins and add on's which make it a light-IDE.
It has most things we need, like auto-complete, code suggestions, debuggers, themes and many more.
There are plugins for almost all languages and for almost all needs that you might have. I have used VSCode to write some Java sometime back, I didn't regret it but I feel Idea IntelliJ has done a better job and understands a Java programmer more than Editors or other IDEs like Eclipse.
My favourite plugin is VSlack. You can immediately send some code snippet to your slack chat account. You don't have to worry about copy-paste and code formatting as the plugin will do all that for you.
There are plugins which even allow you to chat inside VSCode, I have found them useful too sometimes. Not to mention git plugins which save you everyday!
All in all it isn't a bad choice if you ask me. It's light, starts up fast and gives you whatever support you need.
Cheers to VSCode! ✌🍻
Software Engineer worth a nix