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When I create a new Java project or open an existing one, IntelliJ doesn’t highlight any of the text nor does it suggest anything. All the code is 1 single color. I’ve marked my src file, made sure power safe is off, made sure highlight is enabled, and even reinstalled IntelliJ CE. I’ve also disabled all plugins. Any suggestions is appreciated.
picture here
Your screenshot shows that the file is not recognized as a java source file.
Go to Preferences -> Editor -> File types
Scroll down in the list of Recognized File Types and click Java.
In the list of registered patterns make sure it shows *.java.
Also ensure the file is not marked in the Ignore files and folders section at the bottom of this preferences panel. Perhaps you added it by accident (with some shortcut).
Also, while reinstalling IntelliJ, you have probably imported your previous settings. With it, you inherited this issue.
If this doesn't help, please share a screenshot of your project/module structure and setup.
Last but not least, try to create the file using the context menu. E.g. try to right click on your src folder and select new and select Java class or Package from the options. Would be good to check anyway, to see if these are valid options. If they do not appear here, it indicates the project setup is erroneous.
Solved! Thanks to #yole I did the following 'make sure that the *.java extension is listed in "Registered patterns" for the Java file type in Settings | Editor | File Types".
The autocomplete of eclipse is not working now and I searched for hours but I couldn't find an answer to solve it. I haven't used it for long time then the first thing after opening it was to install SWT and windows builder even though I had swing installed. What I mean is, it is may possibly be because of some conflict caused by swt and swing(I read something about a conflict but I don't if this is possible).
Strange thing is it doesn't show anything when I press ctrl+space but when I go Edit-> Content Assist -> Default(it says Ctrl+Space nearby it), it shows things needed to be shown/works as desired.
public class Dsada {
String sssss;
public Dsada(){
sss //pressing ctrl+space is not working,Edit->ContentAssist->Default works fine
}
}
The solution is not to tick/untick some stuff under Windows->Preferences->...->Content Assist-> Advanced. I checked if "ctrl+space" is hijacked by some other thing which is not and checked keyboard language which is English(Those are suggested in mkyong).
I read something about a bug but I couldn't understand. I tried to delete eclipse and re-install again but I guess some settings just stayed in the machine so that it didn't work.
This is recurring for me. I'm using Eclipse 2019-03 in Windows 10.
The steps below work for my case, and does not require a restart.
Window->Preferences->Java->Editor->Content Assist->Advanced
The following options are de-selected, and when I set them the autocomplete worked as before. No restart needed.
1. Java Non-Type Proposals
2. Java Proposals
3. Java Type Proposals
4. Java Proposals (Task-focused)
I don't know what's triggering this but it only happens after I've created a new project. Usually doesn't. It simply doesn't happen often enough for me to notice a pattern to follow up on more.
Clearly this problem occurs with a variety of causes, so review the other answers to see if they match your case.
The hot key combination ctrl+space might be conflict with other settings in system if you are using windows.
Try modify this combination like alt+/, i always use this one since the first time i knew eclipse. It works well.
Hope it works for you.
Window->Preferences->Java->Editor->Content Assist->Advanced
The following options have to be selected, then the autocomplete worked . No restart is required.
Java Proposals (must be selected, not sure the follows)
Java Non-Type Proposals
Java Type Proposals
Java Proposals (Task-focused)
I was facing the same issue. If you use OS X Eclipse Ctrl+Space shortcut can be interfering with OS X system's "Selecting previous input source" using Ctrl+Space shortcut as default.
It is necessary to
edit System Preferencies/Keyboard/Shortcuts/Input Source and uncheck the "Selecting previous input source" or change the shortcut on something else. Eclipse should work after that even without restart.
I faced hot key problem with use Ctrl+Space. I tried to fix the issue first by Windows->Preferences->...->Content Assist-> Advanced and selected
Select the proposal kinds contained in the 'default' content assist list:
Other Java Proposals,
List item
SWT Template Proposals
Template Proposals
Type Proposals
but didn't help.
Therefore, I tried another solution. There would be multiple languages on your computer which could be eating up your Ctrl command. To solve this Go to Control Panel -> Region and Language -> Keyboards and Languages (tab) and then Change Keyboards.
You’ll see a list of languages installed – remove any that you don’t want (click the language and then click the Remove button) until you only have the ones you want left. That fixed it for me, but you can also check the Advanced Key Settings tab to make sure that none of the keyboard short-cuts that are set include Ctrl-Space.
Once you’ve done that, Ctrl-Space should work nicely!!!!
I had the same Problem on Ubuntu 14.04. The problem for me was that ibus used Ctrl+Space as a shortcut. I solved it by starting the program ibus-setup and chaning the shortcut to something else than Ctrl+Space.
Go to Windows >> Preferences » Java » Editor » Content Assist. Then Check the Auto activation triggers for java, Add this in the text box .abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
Recently, I also faced this issue. When I install neon version eclipse.
By (1) deleting respective class, (2) restoring defaults appearance and (3) restarting eclipse, solved the problem for me.
Hope it will help someone.
Go to Preferences » Java » Editor » Content Assist » Advanced. Make sure Other Java Proposals is ticked/checked.
I checked windows has no conflict of ctrl+space (of eclipse autosuggestion) with windows.
This is mere configuration issue of eclipse. reinstallation would fix it.
Thanks.
I select all the parameters in Preferences -> Java -> Editor -> Content Assist -> Advanced.
It help me and resolve the my problem.
Cltr+space work using this step.
Saving my work and restarting Eclipse solved this for me. I hadn't shut down Eclipse in a while, maybe weeks.
I had the same problem (MacOS Monterey, Eclipse 06-2022). Turned out it works with pressed fn button.
For Mac user, you can try : Preferences -> Java > Editor > Content Assist and then :
tick the field "Enable auto activation"
in the field Auto activation trigger for Java, you can input the text alphabet ".abcdefghijklmnopqrstuvwxyz"
This question already has answers here:
IntelliJ show JavaDocs tooltip on mouse over
(21 answers)
Closed 5 years ago.
I just switched from Eclipse to IntelliJ. IntelliJ lacks one feature from Eclipse - when you put your mouse over a method, Eclipse shows javadoc info. I think the way to show it is to use a shortcut - command+J, but when I click it, I get something wrong as on the screen shot below. Please advise me on how I can quickly get javadoc information. I need to at least know what type a method returns.
Use View | Quick Documentation or the corresponding keyboard shortcut (by default: Ctrl+Q on Windows/Linux and Ctrl+J on macOS or F1 in the recent IDE versions). See the documentation for more information.
It's also possible to enable automatic JavaDoc popup on explicit (invoked by a shortcut) code completion in Settings | Editor | General | Code completion (Autopopup documentation):
Yet another way to see the quick doc is on mouse move:
Alternatively you can position your cursor on the item and show JavaDoc using
CTRL+Q
which is the default shortcut.
Edit: As Methical mentioned on Mac the shortcut is
CTRL+j (^+j not ⌘+j)
Go to File/Settings, Editor, click on General.
Scroll down, then ✔ Show quick documentation on mouse move.
There is nice feature which shows quick documentation when your mouse is over element.
IntelliJ 14
Editor / General -> Show quick documentation on mouse move
Older versions
Add the following line to idea.properties file:
auto.show.quick.doc=true
Configuration for IntelliJ IDEA CE 2016.3.4 to enable JavaDocs on mouse hover. I am running IntelliJ IDEA on Mac OS but believe that Linux/Windows should have similar options.
Autopopup docs:
IntelliJ IDEA > Preferences > Editor > General > Code Completion
Documentation on mouse move:
IntelliJ IDEA > Preferences > Editor > General
NOTE: Please hit Apply button to apply these settings
To best mirror Eclipses functionality, enable the following settings:
IDE Settings/Editor -> Other.Show quick doc on mouse move
IDE Settings/Editor/Code Completion -> Autopopup Documentation
To see the javadoc in the autocomplete menu, hit '.' to get the popup, then hover over the object you are working with, once you get the javadoc popup, you can select an item in the popup to switch the javadoc over. Not ideal... But its something.
As another note. The search functionality of the options menu is very useful. Just type in 'doc' and you will see all the options for doc.
Also, searching for "autopopup doc" will not only find each of the options, but it will also highlight them in the menu. Pretty awesome!
Edit:
Going beyond the initial question, this might be useful for people who just want quick and easy access to the docs.
After using this for a few more days, it seems just getting used to using the hotkey is the most efficient way. It will pop up the documentation for anything at the spot of where your text input marker is so you never have to touch the mouse. This works in the intellisense popup as well and will stay up while navigating up and down.
Personally, Ctrl+Q on windows was not ideal so I remapped it to Alt+D. Remaping can be done under IDE Settings/Keymap. Once in the keymap menu, just search for Quick Documentation.
For me, it wasn't just getting the javadoc window to open, but also getting the complete javadoc to present. You may still get a sparse javadoc that is based solely on the method signature if you are importing libraries from a Maven repository and do not tell Idea to include the javadocs in the download. Be sure to tick the "JavaDocs" option in the "Download Library From Maven Repository" dialog, which can be found under Project Structure -> Projtect Settings -> Libraries.
Go to Settings -> Editor -> General then enable Show quick documentation on mouse move
IntelliJ IDEA 15 added this feature
Now it is available as EAP.
As you can see in the picture below, the caret position doesn't influence the cursor position:
This feature was implemented in IntelliJ IDEA 15 142.4675.3 Release Notes.
The closest to Eclipse will be Ctrl+Button2 Click (Scroll click)
It's called Quick Doc in IntelliJ, I wish guys from JetBrains one day add quick doc like Eclipse with Ctrl+Mouse Move it's so much better.
In my case only with only mouse move is a bit annoying, so if you search in Preferences/Settings --> Keymap for "quick documentation" you will find:
Win-Linux: "Ctrl+Q" and "Ctrl+Button2 Click" (Scroll click)
Mac: "Ctrl+J" and "Ctrl+Button2 Click" (Scroll click)
I have noticed that selecting the method name and pressing F2(Quick Documentation) dispalys it's JavaDoc.
I am using Intellij 2016, and Eclipse Keymap
Just curious if there's a setting somewhere in Eclipse to keep blocks of code collapsed when the class is opened? It's just I'll collapse methods then when the class is re-opened, everything is expanded.
Thanks
In Windows > preferences:
Java > editor > folding: check all, click apply & then OK.
Maybe this helps: Ctrl + Shift+ NUM_KEYPAD_DIVIDE collapse all methods in a java class.
Source
Yes . From the eclipse official documentation :
You can specify which regions are folded by default when an editor is
opened. Have a look at the Opens the folding preference page Java >Editor > Folding
preference page to customize this.
Just click all the checkboxs .Then whenever a .java file is open in the java editor , everything will be collapsed.
Not sure if this options is the new feature for eclipse indigo version (3.7) , so you may have to update your eclipse to indigo if you use older version but cannot find this option.
I'm not aware of a solution, but let me tell you how I work - maybe this is a solution for you as well:
Enable "Only show the selected Java element". The editor will only show the element (method) you selected (see screenshot).
While editing a file use either the Outline view or CTRL + O to navigate through the class file.
Btw: I disabled all folding options as the above approach just works best for me. Sadly, I'm not aware of a shortcut to enable/disable the "Only show the selected Java element".
Yes, you can set the options what to fold on file open.
You can find it at Settings->Editor->Folding
It features a resonable selection of folding options.
I've been generifying some Java code that used lots of casts, and now most of them are redundant and unnecessary.
It could be very tedious to inspect all the usages of the code to remove them, so: are there any tools to help to identify (and remove) superfluous casts?
This can be automatically done using Eclipse Helios. In your project, go to Properties -> Java code Style -> Clean Up. There, edit a profile, go to the "Unnecessary Code" Tab and check "Remove unnecessary casts". Then right-click your source root and klick Source-> Clean up. Job done.
If you're using Android Studio it's an easy fix: Analyze > Code Cleanup
In Eclipse, under "warnings and errors" you can set "Unnecessary cast or instanceof operations" to be "Warn" or "Error" rather than "Ignore". That should help you find them very quickly, although it won't clean them up for you.
But you can also set a "Save" action configured with an "Additional action" of "Remove unnecessary casts".
And you can right-click on an area of Package Explorer, select "Clean up..." and configure that with a "Remove unnecessary casts" action.
So basically this should be simple :)
You should probably use a tool to analyze your Java source code for potential problems (such as unnecessary casting).
Perhaps you can try PMD: http://pmd.sourceforge.net
If you use Eclipse, this should be fairly easy. Right click the class/package/project and select Source - Clean Up....