How to select/copy current line without using mouse in IntelliJ IDEA

Question

To duplicate lines I use

Ctrl + D

Is there a similar way to select/copy current line using keyboard in IntelliJ IDEA?

Answer 1

In Mac OS ，i would like to keymap :

Command + D (Duplicate Line Or Selection) ==> Command + D (Duplicate Entire Lines)

This can duplicate a/multi line with the caret (insertion point) ,work in IntelliJ 2018.1.

or another way:

copy multiline with the caret (insertion point),not change keymapp, copy extra newline feed hidden "\n":