On Java in a notebook you will not write much! Even for pure Java development, you need to have a lot of knowledge to correctly register all calls to system classes and their methods and also when connecting an additional library. How to debug the code in several thousand lines, dozens of classes and hundreds of methods? How can you keep it in your head?
This will help you Java editors or development environment to speed development, reduce the number of errors, and fine-tune the program, as well as simply to ease your work.