IntelliJ show JavaDocs tooltip on mouse over

Question

In Eclipse  when hovering over a method  variable  etc  a tooltip is displayed with the corresponding JavaDocs  Is there such a feature in IntelliJ

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File-- Settings-- Editor  Check  Show quick doc on mouse   Now when you put the mouse over a method a tooltip with the documentation will appear  Sometimes the tooltip size is too small and you will have to resize it moving the mouse down to the bottom of the tooltip

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The answer is CTRL   P  NOT CTRL   Q   Someone else posted this answer on JetBrains forum  The idea is a different IDE  Try to discover its features and try to make the best of it  rather than trying to emulate whatever you used before  For the most part  Idea has very high usability  much better than Eclipse IMHO  and is streamlined for supporting code editing as best as possible  rather than relying on wizards too much for example     Javadoc  Ctrl-Q  A quick view of the implementation   Ctrl-Shift-I Show context   Alt-Q Show parameters  in a method call    Ctrl-P Show error description   Ctrl-F1       plus many more shortcuts to navigate in code and different idea views   I think it rather nice that you can see just the specific bit of information you are interested in with a simple keystroke  Have a look at the menus which will also show the possibly modified shortcuts for your keymap   0 Avatar Jens Vo   Created June 12  2008  09 26 And  elsandros  in addition to what Stephen writes  Since you seem to be interested in IDEA s keyboard shortcuts  I highly recommend the  Key Promoter  plugin which helps you memorize the relevant shortcuts quickly   Also very useful is the  Goto Action  feature  invoked by Ctrl-Shift-A  In the popup  you can enter a keyword  e g   Javadoc    and the IDE tells you the available actions matching your search  along with keyboard shortcuts and the containing action groups  which often also give you a clue about how to navigate to the action using the menu

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For IntelliJ 13  there is a checkbox in Editor s page in IDE Settings  EDIT  For IntelliJ 14  the option has been moved to Editor  gt  General page  It s the last option in the  quot Other quot  group   For Mac the option is under the menu  quot IntelliJ Idea quot   gt   quot Preferences quot    EDIT  For IntelliJ 16  it s the second-to-last option in Editor  gt  General  gt  Other  EDIT  For IntelliJ Ultimate 2016 1  it s been moved to Editor  gt  General  gt  Code Completion   EDIT  For IntelliJ Ultimate 2017 2  aka IntelliJ IDEA 2017 2 3  there are actually two options   In Editor  gt  General  gt  Other  section   gt  Show quick documentation on mouse move - delay 500 ms   Select this check box to show quick documentation for the symbol at caret  The quick documentation pop-up window appears after the specified delay    In Editor  gt  General  gt  Code Completion  sub-item   gt  Autopopup documention in 1000 ms  for explicitly invoked completion   Select this check box to have IntelliJ IDEA automatically show a pop-up window with the documentation for the class  method  or field currently highlighted in the lookup list  If this check box is not selected  use Ctrl Q  to show quick documentation for the element at caret  Quick documentation window will automatically pop up with the specified delay in those cases only  when code completion has been invoked explicitly  For the automatic code completion list  documentation window will only show up on pressing Ctrl Q   EDIT  For IntelliJ Ultimate 2020 3  the first option is now located under Editor  gt  Code Editing  gt  Quick Documentation  gt  Show quick documentation on mouse move

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The easiest way  at least for me  was    Ctrl Shift A Type  show document Show quick documentation on mouse move  set it to ON

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In IntelliJ IDEA 14  it has moved to  File -  Settings -  Editor -  General -   Show quick doc on mouse move

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For Intellij 15  use the checkbox in File  gt  Settings  gt  Editor  gt  General option Show quick documentation on mouse move     You can also get there by typing  quick  or something similar in the search box

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On my IntelliJ U on Mac I need to point with cursor on some method  variable etc  and press  cntrl  or  cmd  key  Then click on the link inside popup window which appeared to see JavaDocs

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Adding on to what ADNow said  On the Macintosh     Right click on IntelliJ IDEA 12 Click on the Show Package Contents menu option Open the bin folder Open idea properties Add the line   auto show quick doc true

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All of the above methods are useful but one basic thing missing you need to have src zip in your JDK  C  Program Files Java jdk1 8 0 171   I assumed it comes preinstalled but for some reason  it was not present in my installation  Another thing to check is if your project is using the specified  1 8 0 171 in this case  JDK

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A note for Android Studio  2 3 3 at least  users  because this page came up for my google search  android studio hover javadoc   and android studio is based on Intellij   See File- Settings- Editor- General   show quick documentation on mouse moves   rather than File- Settings- Editor- General- Code Completion  Autopopup documentation in  ms  for explicitly invoked completion   and  Autopopup in  ms    which has been previously talked about

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It is possible in 12 1   Find idea properties in the BIN folder inside of wherever your IDE is installed  e g  C  Program Files  x86  JetBrains IntelliJ bin  Add a new line to the end of that file   auto show quick doc true   Start IDEA and just hover your mouse over something

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In 2020 1 there is in editor javadocs rendering has been added  Screen shots borrowed from intellij documentation

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Up until IntelliJ version 11  no  not just by hovering over it  If the cursor is inside the method- or attribute name  then CTRL Q will show the JavaDoc on  nix and Windows  On MacOSX  this is CTRL J   Quote   No  the only way to see the full javadoc is to use Quick Doc  Ctrl-Q    -- http   devnet jetbrains net thread 121174  EDIT  Since IntelliJ 12 1  this is possible  See  ADNow s answer

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In Intellij13  you can use Editor configuration like below

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After doing CTRL Q  you can    Pin the tooltip  top right corner  Check Docked Mode  under gear in top right after pinning  Size as desired Click icon for Auto show documentation for selected item    Then when you move your cursor  the documentation will appear in this box   It costs you a little screen real estate  but I find it s worth it   I d post a screenshot but SO won t let me post images

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I tried many ways mentioned here  especially the preference - editor - general - code completion - show documentation popup in   isn t working in version 2019 2 2  Finally  i am just using F1 while caret is on the type method and it displays the documentation nicely  This is not ideal but helpful

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From IntelliJ Ultimate 2018 1 5  aka IntelliJ IDEA 2018 1 5  till 2019 3    there are actually two options under File -  Preferences    In Editor   General   Other  section    Show quick documentation on mouse move - delay 500 ms   Select this check box to show quick documentation for the symbol at caret  The quick documentation pop-up window appears after the specified delay   In Editor   General   Code Completion  sub-item    Auto-display documentation in 1000 ms   Select this check box to have IntelliJ IDEA automatically show a pop-up window with the documentation for the class  method  or field currently highlighted in the lookup list  If this check box is not selected  use Ctrl Q to show quick documentation for the element at caret  Quick documentation window will automatically pop up with the specified delay in those cases only  when code completion has been invoked explicitly  For the automatic code completion list  documentation window will only show up on pressing Ctrl Q

User · Answer

IDEA has  find action    Open  Help  menu  type  doc   move cursor to  Quick Documentation  it will be highlighted   Also  find action  can be called from hot key  you can find it in settings- hotkeys

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In Intellij 2019  I did   File   Settings   Editor   General option Show quick documentation on mouse move

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On mac in IntelliJ Ultimate  trial  14 I have mine under Settings  gt  Editor  gt  General  gt  Code completion  The tooltip short is F1 on my laptop   It s called  Autopopup documentation in  ms

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IntelliJ IDEA 14 0 3 Ultimate  Press Ctrl Alt S  then choose Editor General choose Show quick domentation on mouse move   Tips  Look at the top right conner  gear icon  at JavaDoc pop-up window  You can choose  - Show Toolbar  - Pinded Mode  - Docked Mode  - Floatting Mode  - Split Mode

[java] IntelliJ show JavaDocs tooltip on mouse over

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