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If you want to do it manually you can try that out using any mind mapping application or draw.io, sketchboard.io, realtimeboard.com.
If you want to convert the code to control flowchart, maybe you can try something like https://code2flow.com/app
For UML diagrams, IntelliJ has different plugins for that. So that you can drag and drop the classes to convert them into a diagram.
