IntelliJ IDEA 14, 15, 2016 & 2017
Format existing code
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Ensure right margin is not exceeded
File > Settings > Editor > Code Style > Java > Wrapping and Braces > Ensure right margin is not exceeded
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Reformat code
Code > Reformat code…
or press Ctrl + Alt + L
If you have something like this:
thisLineIsVeryLongAndWillBeChanged(); // comment
it will be converted to
thisLineIsVeryLongAndWillBeChanged(); // comment
instead of
// comment thisLineIsVeryLongAndWillBeChanged();
This is why I select pieces of code before reformatting if the code looks like in the previous example.
Wrap when typing reaches right margin
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IntelliJ IDEA 14: File > Settings > Editor > Code Style > Wrap when typing reaches right margin
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IntelliJ IDEA 15, 2016 & 2017: File > Settings > Editor > Code Style > Wrap on typing