How to see an object's full type name in IntelliJ Idea?

Question

For example, having the following code:

// This is hidden from my eyes
String str = "abc";

// I can see this
System.out.println(str);

i'd like to point to str in the last line and see that it's type is indeed java.lang.String (not just String). Where can I find this information (I am sure Idea knows it, as it can show the object's members correctly)?

This seems like plain old Java... why is it tagged as scala? — Pablo Fernandez, Oct 19 '11 at 01:06
@pablo-fernandez, because I want this for Scala actually, but I believe this is done the same way with Java and there are more Java developers than Scala developers to answer the question. — Ivan, Oct 19 '11 at 01:08

score 32 · Accepted Answer · answered Oct 19 '11 at 01:07

32

Hover the mouse over the identifier with the ctrl key held down, and you will see a tooltip containing the full type name.

answered Oct 19 '11 at 01:07

Ricky Clarkson

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In Kotlin, this works for me on usages of the variable, but not at the declaration. Given that Kotlin declarations can have implicit types, this is a pain! – Martin Eden Feb 08 '17 at 11:14
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is there a keyboard shortcut for this? – Joey Baruch Mar 13 '18 at 11:52
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CTRL + Q is the Quick documentation lookup and will include the type – Brad Oct 01 '19 at 11:32
@Brad unfortunately, it doesn't. At least no in version 2021.3.1 CE – bruno Jan 31 '22 at 12:55
My original answer and the Ctrl-Q one from Brad both still seem to be correct. I'm on 2021.2.4 UE. – Ricky Clarkson Jan 31 '22 at 21:23

LCE · Answer 2 · 2016-10-11T09:24:12.587

31

If you place the caret inside the variable you want to identify and press

CTRL + SHIFT + P

a small popup will show the type like so:

If you place the caret inside an expression, Idea will first ask what part of the expression you want to identify.

edited Oct 11 '16 at 09:24

answered Oct 11 '16 at 09:02

LCE

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score 1 · Answer 3 · answered Feb 02 '16 at 16:00

The control-[hover over the identifier] thing works for Scala, but I don't use it very often. Most of the time I want to know the type of an expression, not just a symbol. [select an expression] followed by control-shift-P is the way to get that.

The command is called "expression type", so if those keyboard shortcuts aren't working for you, hit ⌘-shift-A and type in "expression type". It'll tell you your current shortcut for that command.

Closely related: I'll often tell Intellij to add type annotation to a binding. If your cursor is on fnord in a line like this:

var fnord = Monoid[Flurbish].sharky.shark.shark(!snowball)

Hit option-return, and one of the things you can do is add type annotation. If type annotation is already there, you can remove it, or if you've changed the type of the expression you can then have Intellij update the type annotation to the new one. (The command is called "Add type annotation to value definition")

score 1 · Answer 4 · answered Sep 02 '18 at 07:41

1

F1 key has worked for my Mac's community version: 2018.1.6

answered Sep 02 '18 at 07:41

unknownerror

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score 0 · Answer 5 · answered Mar 11 '20 at 07:34

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In CLion variant you can see a variable's definition in a pop-up with Command + Shift + I (Command uppercase letter 'i') ("Inspect" in my head to help me remember it).

answered Mar 11 '20 at 07:34

Andrew Mackenzie

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score 0 · Answer 6 · answered Jan 14 '21 at 17:45

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In intelliJ you can directly jump to the type/class by pressing the keys CTRL+SHIFT and clicking with the mouse on the variable. That has the same effect as if you would ordinarily click with the mouse on the type along with key CTRL.

answered Jan 14 '21 at 17:45

kladderradatsch

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score 0 · Answer 7 · answered Oct 19 '11 at 07:37

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[Ctrl]+[Alt]+T when the curser is inside the identifier. Also works for the return types of method invocations.

answered Oct 19 '11 at 07:37

ziggystar

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Currently, CTRL+ALT+T is the 'surround with' shortcut. – CLOVIS May 02 '20 at 17:01

How to see an object's full type name in IntelliJ Idea?

7 Answers7