How to infer and complete variable type with Intellij IDEA

Question

This could be a simple one and there may be duplicates of this type of question, but I can't find the answer anywhere. I want to complete the type of the variable by inferring the method's return type in Java. For example,

users = userService.findAllUsers()//This method returns List<User> objects

Now I want to place cursor on users variable and initialise it inline by selecting a "shortcut" key and Intellij will complete the above statement like below.

List<User> users = userService.findAllUsers()//This method returns List<User> objects

How is this possible? Do I need to add a custom shortcut to keymap or is there one already available like in Eclipse? Finally I would like to know the shortcut for Mac OSX if there is one available.

Ripp

Answer 1

For Windows

Use Ctrl+Alt+V to create variable (as it says here)

For Mac OS

Use ⌘+⌥+V

Discernment

Thanks, My question was how it can be done on Mac OS X. I figured out that it is <option> + <Command> + V (with the help of the post you mentioned) – Ripp

N.B. sadly this does not work in for loops ie for (user : findAllUsers()) – Dan

Answer 2

I have found the IntelliJ Postfix Code Completion very useful and powerful.

In your case you could do like this:

• Create your expression without any variable

• Start typing .var at the end of the expression and you will get a context menu with var as a selectable item. Press Enter and a new variable will be created for you:

Angwantibo

Answer 3

Select the variable/expression you want to check and you can either:

• Click CTRL+SHIFT+P and a small type info will appear.
• Click CTRL+Q and the documentation of that expression will appear if available.
• Hold CTRL and mouse hover the variable/expression and a small type info will appear.

Soulier