Mention needed imports at top of "Analyzing data flow in Java" #13692
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Currently the guide just starts using the classes from these libraries without having mentioned that you have to import the libraries first.
This is rather inconvenient and I always end up scrolling down somewhere to the examples where the needed imports are used.
Any feedback is appreciated, especially regarding wording or position of this information in the document.
The guides for the other languages might benefit from this change as well, please let me know if I should change it there as well, though I am not familiar with the needed imports there. Or feel free to perform these changes yourself and push them onto the branch of this pull request.