问题
Does Eclipse have a hot key to comment a block? and to uncomment a block?
回答1:
Ctrl-/ to toggle "//" comments and Ctrl-Shift-/ to toggle "/* */" comments. At least for Java, anyway - other tooling may have different shortcuts.
Ctrl-\ will remove a block of either comment, but won't add comments.
Note: As for Eclipse CDT 4.4.2, Ctrl-Shift-/ will not uncomment a "/* */" block comment. Use Ctrl-Shift-\ in that case.
EDIT: It's Ctrl on a PC, but on a Mac the shortcuts may all be Cmd instead. I don't have a Mac myself, so can't easily check.
回答2:
There are two possibilities:
Every line prepended with //
ctrl + / to comment
ctrl + \ to uncomment
Note: on recent eclipse cdt, ctrl + / is used to toggle comments (and ctrl + \ has no more effect)
Complete block surrounded with block comments /*
ctrl + shift + / to comment
ctrl + shift + \ to remove
回答3:
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.
回答4:
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.
回答5:
I have Eclipse IDE for Java Developers Version: Juno Service Release 2 and it is -
Every line prepended with //
ctrl + / for both comment and uncomment .
回答6:
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'):
- to add a block comment, the shortcut (binding) is: Ctrl + Shift + /
- to remove a block comment, the shortcut (binding) is: Ctrl + Shift + \
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:
- Change the binding of command 'Add Block Comment' (when 'Editing Java Source') from 'Ctrl + Shift + /' to 'Ctrl + Shift + 7'
- Change the binding of command 'Remove Block Comment' (when 'Editing Java Source') from 'Ctrl + Shift + \' to 'Ctrl + Shift + 8'
- Unbind the binding 'Ctrl + /' for command 'Toggle Comment' (when 'Editing Java Source'); instead of assigning a new binding, I simply unbound this shortcut, as there already was one with Ctrl+7 and one with Ctrl+Shift+C (which both work for me)
回答7:
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.
回答8:
for java code
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
回答9:
In addition, you can change Eclipse shortcut in Windows -> Preferences -> General -> Keys
回答10:
Using Eclipe Oxygen command + Shift + c on macOSx Sierra will add/remove comments out multiple lines of code
回答11:
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!
回答12:
It depends upon the version of OS - for me it works with Command + 7
回答13:
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.
回答14:
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
回答15:
For single line comment just use // and for multiline comments use /* your code here */
回答16:
Select the text you want to Block-comment/Block-uncomment.
To comment, Ctrl + 6
To uncomment, Ctrl + 8
来源：https://stackoverflow.com/questions/2001586/how-to-comment-a-block-in-eclipse