JEP draft: Concise Method Bodies - extend this to local functions?

Alex Buckley alex.buckley at
Thu Sep 20 20:46:51 UTC 2018

On 9/20/2018 1:28 PM, Maurizio Cimadamore wrote:
>>> Function<A,B> fun() = Utils::bar;
>>> Function<A,B> fun = Utils::bar;
>>> (first is method body, second is variable initializer)
>> I think Remi is noting the fact that, when using `->`, the single
>> expression can be a method reference expression. I have already
>> recorded this situation near the end of the JEP.
> Ok - then I added another :-) [not sure we should be worried about it,
> but perhaps worth mentioning in the JEP]

The puzzler practically writes itself. We distinguish:

1.  boolean isEmpty(String s)           =  String::isEmpty;
2.  Predicate<String> isEmpty           =  String::isEmpty;
3.  Predicate<String> isEmpty(String s) -> String::isEmpty;

1.  Method declaration, using method reference form.
2.  Field declaration,  initialized with a method reference exprssion.
3.  Method declaration, using single expression form.


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