Eclipse Oxygen with CDT, PyDev:
Block comments under Source menu
Add Comment Block
Ctrl + 4
Add Single Comment Block
Ctrl+Shift+4
Remove Comment Block
Ctrl + 5
For single line comment just use // and for multiline comments use /* your code here */
Using Eclipse Mars.1 CTRL + / on Linux in Java will comment out multiple lines of code. When trying to un-comment those multiple lines, Eclipse was commenting the comments. I found that if there is a blank line in the comments it will do this. If you have 10 lines of code, a blank line, and 10 more lines of code, CTRL + / will comment it all. You'll have to remove the line or un-comment them in blocks of 10.
I have Mac ,I was also facing problem to comment multiple line in STS
I have tried
single line comment:
command+/
Multi line comment:
control+command+/
Multi line uncomment:
control+command+\
And it was success
There are two possibilities:
ctrl + / to comment
ctrl + \ to uncomment
Note: on recent eclipse cdt, ctrl + / is used to toggle comments (and ctrl + \ has no more effect)
ctrl + shift + / to comment
ctrl + shift + \ to remove
In addition, you can change Eclipse shortcut in Windows -> Preferences -> General -> Keys
For JAVA :
Single line comment:
// this is a single line comment
To comment: Ctrl + Shift + C
To uncomment: Press again Ctrl + Shift + C
Multiple line comment:
/* .........
.........
......... */
First, select all the lines that you want to comment/uncomment then,
To comment: Ctrl + Shift + C
To uncomment: Press again Ctrl + Shift + C
I hope, this will work for you!
For single line comment you can use Ctrl+/ and for multiple line comment you can use Ctrl + Shift + / after selecting the lines you want to comment in java editor.
On Mac/OS X you can use ? + / to comment out single lines or selected blocks.
I have Eclipse IDE for Java Developers Version: Juno Service Release 2
and it is -
ctrl + / for both comment and uncomment .
if you want comments single line then put double forward slash before code of single line manually or by pressing Ctrl +/
example: //System.Out.println("HELLO");
and for multi-line comments, Select code how much you want to comments and then press
Shift+CTRL+/
Now for XML code comments use Select code first and then press Shift+CTRL+/ for both single line and multi-line comments
As other answers pointed out, the following shortcuts are defined by default (I'm referring to editing java source - shortcut bindings can be found in eclipse Window>Preferences, under 'General'/'Keys', search for 'comment'):
Unfortunately, these shortcuts did not work for me (on Eclipse Java EE IDE for Web Developers, version: Juno Service Release 2).
The reason, I think, is my keyboard layout (QWERTZ keyboard layout used in Germany - see here for further information), where '/' actually has to be written via 'Shift + 7'.
I therefore had to change the shortcut bindings for comments (just did it for editing java source) in the eclipse preferences (under 'General'/'Keys') as follows:
Select the text you want to Block-comment/Block-uncomment.
To comment, Ctrl + 6
To uncomment, Ctrl + 8
For Eclipse Editor
For Single Line (Toggle Effect)
Comment : Ctrl+Shift+c
Uncomment: Ctrl+Shift+c
For Multiple Lines (Toggle Effect) (Select the lines you want to comment)
comment : Ctrl+Shift+c
Uncomment: Ctrl+Shift+c
It is for all html , css , jsp , java . It gives toggle effect.
It depends upon the version of OS - for me it works with Command + 7
I came here looking for an answer and ended up finding it myself, thanks to the previous responses.
In my particular case, while editing PHP code on Eclipse Juno, I have found that the previous commands won't work for me. Instead of them, I should press Ctrl+ 7 (on the superior number key) to obtain the double bar comment ("//"). There's no way I can comment them with the previous mentioned key combinations.
Using Eclipe Oxygen command + Shift + c on macOSx Sierra will add/remove comments out multiple lines of code
Source: Stackoverflow.com