IDEA: "Assign statement to new local variable"?

Question

As a long time Eclipse user, I'm playing around a little bit with IntelliJ IDEA 10. I can't seem to find out how to perform an "Assign statement to new local variable" code completion.

Feature explanation:

I type something like

new BufferedOutputStream(out)

and then hit Cmd (or Ctrl)+1 and enter, and Eclipse changes the line into:

BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(out);

At the same time, I can type over "bufferedOutputStream" immediately to rename it (or select from the options "bufferedOutputStream", "outputStream" and "stream" from a dropdown).

I use this feature for absolutely every assignment, and it's an enormous time saver - this must be available in IDEA, too - but where is it hidden?

CrazyCoder · Accepted Answer · 2018-05-31T19:14:37.483

58

Refactor | Introduce Variable (Ctrl+Alt+V on Windows). Note that you don't need to select the text if it's the only text in the current line. Then you can change the variable name in-line just like you've described and press Enter to complete editing.

Another way is to use the Postfix Completion:

Type .var (or just .v to select it from the list) and confirm it with Enter.

edited May 31 '18 at 19:14

answered Jan 27 '11 at 12:21

CrazyCoder

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Finally something that works in Android Studio similar to Eclipse. – Bevor Sep 05 '16 at 18:07
Might be obvious, but for Apple users—`Cmd` + `Option` + `v` does the trick. Also, the resolve all is nice—it assigns the variable in the first expression and then replaces the other expressions in that scope with the new variable. – MrColes Dec 01 '16 at 17:13
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Another possibility is to use the Postfix Completion feature of IntelliJ. Typing ".v+ENTER" would normally choose the ".var" postfix completion and introduce the variable. – Lari Hotari Aug 21 '17 at 16:20
@LariHotari's comment should be part of the answer, it is much faster this way : https://blog.jetbrains.com/idea/2014/03/postfix-completion/ – FredBoutin May 31 '18 at 13:16

score 11 · Answer 2 · edited Oct 19 '15 at 09:27

As CrazyCoder mentions you can use Ctrl+Alt+V. Also instead of selecting the expression, clicking into somewhere in your expression and using Ctrl+W to expand scope is very useful while using introduce refactorings. Extract refactorings are:

Extract variable: Ctrl+Alt+V
Extract field: Ctrl+Alt+F
Extract method: Ctrl+Alt+M
Extract parameter: Ctrl+Alt+P
Extract constant: Ctrl+Alt+C

Also, Idea is a polygot editor so you can use these extract refactorings for other file types like js or html also (not all refactorings work in all file types but Ctrl+W works mostly).

There are more extract refactorings which do not have shortcuts which you can access from Refactor|Extract menu (both menu bar and context menu). To quick access all refactorings you can use Ctrl+Alt+Shift+T for a popup menu.

As a last word, I highly encourage you using "Tip of the Day" (Help|Tip of the Day). It is a fast way to learn many helpful features of Idea.

score 4 · Answer 3 · edited Jul 22 '13 at 10:16

4

It's not as nice as Eclipse, but you can try the following:

new BufferedOutputStream(out)

Select the expression above, either with your mouse (or by using Ctrl+W).
Then hit Ctrl+Alt+V to Introduce a Variable or (Ctrl+Alt+F to Introduce a Field)

edited Jul 22 '13 at 10:16

Hulk1991

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answered Jan 27 '11 at 12:14

dogbane

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Selecting is not necessary in most cases, see my reply. – CrazyCoder Jan 27 '11 at 12:22

score 0 · Answer 4 · answered Oct 09 '21 at 19:16

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Easiest is, hit Alt+Enter, you will be offered with a list of options, and just select "Introduce local Variable".

answered Oct 09 '21 at 19:16

Zeljko Kozina

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IDEA: "Assign statement to new local variable"?

4 Answers4

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