How to have the formatter wrap code with IntelliJ?

IntelliJ IDEA 14, 15, 2016 & 2017

Format existing code

1. Ensure right margin is not exceeded

   File > Settings > Editor > Code Style > Java > Wrapping and Braces > Ensure right margin is not exceeded

   

2. 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

• IntelliJ IDEA 14: File > Settings > Editor > Code Style > Wrap when typing reaches right margin

  

• IntelliJ IDEA 15, 2016 & 2017: File > Settings > Editor > Code Style > Wrap on typing

  

Do you mean that the formatter does not break long lines? Then please check:

Settings / Project Settings / Code Style / Wrapping

Update: In later versions of IntelliJ, the option can be found under:

Settings / Editor / Code Style

There select Wrap when typing reaches right margin.

Enabling "Ensure right margin is not exceeded" doesn't work for me in Intellij IDEA 2018.2. I have found the workaround, we need to change every elements below from "Do not wrap" to "Wrap if long".

After that, we can preview what kind of wrap type will be changed by looking into right panel. If we are satisfied, Click "OK" or "Apply" to apply the changes. Finally we need a mannual format by using CTRL+ ALT+ L in Windows and Command+ Shift+ L in MacOS.

Or you can use the shortcut:

Ctrl + Alt + L