JEP 186: Collection Literals

[Artur Biesiadowski]

Problem is that you need to differentiate list and set (and map possibly).

Few examples from existing languages

Groovy:

List  [1,2,3]
Set   [1,2,3] as Set
Map   ["a":1, "b":2]

Xtend

List  #[1,2,3]
Set   #{1,2,3}
Map   #{"a"->1, "b"->2}

Scala

List  Array(1,2,3)
Set   Set(1,2,3)
Map   Map("a"->1, "b"->2)

C#

List  new List<int> {1,2,3}
Set new HashSet<int> {1,2,3}
Map   new Dictionary<string,int>  { {"a":1},{"b":2}  }



Regards,
Artur Biesiadowski

On 14/01/2014 16:30, Paul Benedict wrote:
> I would like to see Java have one way of doing initialization with a series
> of values. C11/C++11 decided that curly braces was the way to go. So I
> would agree with Moshe we should favor curly braces over any new syntax.
>
>
> On Tue, Jan 14, 2014 at 8:34 AM, Millies, Sebastian <
> Sebastian.Millies at softwareag.com> wrote:
>
>> I would certainly expect it to be an immutable list, and I believe the
>> proposal of having collection literals makes most sense in the context of
>> persistent collections. This would be in keeping with evolving Java towards
>> a more functional and parallel-friendly programming style, which entails
>> embracing immutability. In contrast, what's to be gained from a shorter
>> version of Arrays.asList() ?  -- Sebastian
>>
>> -----Original Message-----
>> From: lambda-dev-bounces at openjdk.java.net [mailto:
>> lambda-dev-bounces at openjdk.java.net] On Behalf Of Moshe Sayag
>> Sent: Tuesday, January 14, 2014 2:52 PM
>> To: lambda-dev at openjdk.java.net
>> Subject: Re: JEP 186: Collection Literals
>>
>> 1. What is the exact meaning of:
>>
>> List<Integer> list = #[ 1, 2, 3 ];
>>
>> Will 'list' be an ArrayList, a LinkedList or an immutable list?
>>
>> 2. Java already has the curly brackets {...} to construct an array.
>>
>> int[] array = { 1, 2, 3 };
>>
>> How will the new literal go with it?
>> Will we have:
>>
>> int[] array = #[ 1, 2, 3 ];
>>
>> What about
>>
>> List<Integer> list = { 1, 2, 3 };
>>
>>
>> Moshe
>>
>>
>> On Tue, Jan 14, 2014 at 2:17 AM, <mark.reinhold at oracle.com> wrote:
>>
>>> Posted: http://openjdk.java.net/jeps/186
>>>
>>> - Mark
>>>
>>>
>>
>> Software AG – Sitz/Registered office: Uhlandstraße 12, 64297 Darmstadt,
>> Germany – Registergericht/Commercial register: Darmstadt HRB 1562 -
>> Vorstand/Management Board: Karl-Heinz Streibich (Vorsitzender/Chairman),
>> Dr. Wolfram Jost, Arnd Zinnhardt; - Aufsichtsratsvorsitzender/Chairman of
>> the Supervisory Board: Dr. Andreas Bereczky - http://www.softwareag.com
>>
>>
>>
>