Method reference shortcut transformation in Eclipse Luna

Question

In Spring Tool Suite

(Version: 3.7.0.RELEASE
Build Id: 201506290649
Platform: Eclipse Luna SR2 (4.4.2))

Is there a shortcut to go from something like:

Function<String, Integer> func = str -> Integer.valueOf(str);

to something like this:

Function<String, Integer> func =  Integer::valueOf;

(and backwards) via a keyboard shortcut?

I am aware of Ctrl+1 key combo, but it doesn't seem to offer the method reference conversion, hence this inquiry:

Answer 1

First, you need Eclipse 4.5 or greater, because that's when this particular assist was first published.

Next you should avoid the "unused" warning on the variable, because otherwise content assist will jump to the nearest warning / error rather than proposing a change unrelated to any problem in the current code (this is not strictly necessary, but makes the next step easier).

Finally, you need to position the cursor on the ->, because that's the only piece of syntax definitely identifying the lambda.

See also the first item in the 4.5 "New-&-Noteworthy", Section on JDT.