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Mastering the IDE: Column Selection Mode
When you need to perform the same editing operation on multiple lines, you can use multiple carets.
Call the action Column Selection Mode or press
&shortcut:EditorToggleColumnMode;. You can also
choose Edit | Column Selection Mode in the
application menu. Press the same shortcut to disable the mode.
In Column Selection Mode, you can add more
carets by moving the caret one line up or down while selecting text. Do this by
pressing &shortcut:EditorUpWithSelection; or
&shortcut:EditorDownWithSelection;.
As an exercise, swap the keys and values in a map (transforming it from
Map<Int, String> to Map<String, Int>). Select the three lines specifying
the map contents and switch to Column Selection Mode. Note that you now have several carets. Navigate to the beginning
of a line, to the end of a line, or to the end of the word to see how these
operations are applied to all the carets in all lines.