AutoCloseable interface for classes that already implement it #831
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Description of the new Feature/Bugfix
I added the AutoCloseable interface on those classes which already implement it. Most of them seem to use it to close files or streams in their implementation, so it is recommended to give them this interface.
Related Issue: Problem/enhancement mentioned in #812
Unit-Tests for the new Feature/Bugfix
No new tests needed, because it does not introduce a new feature or fix a bug or change.
Compatibilities Issues
No issues to be expected, but linters will suggest the dev to use try-with-resources.
Testing details
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