Fixes for various CheckStyles issues

This series of patches each fix one very simple CheckStyle issue.  These are all focused on cosmetic issues, and each cosmetic issue is dealt with in its own patch; I haven't yet attempted to address bigger issues, like missing JavaDoc comments or imports that are only imported to make `@link`s shorter.  Nevertheless, this gets us from 1600 to 580 CheckStyles violations, which dramatically improves the signal-to-noise ratio.