RFR 7065380 : Allow Collections.sort to sort Collections.singletonList() result (original) (raw)

Rémi Forax forax at univ-mlv.fr
Thu Mar 1 20:26:01 UTC 2012


On 03/01/2012 08:50 PM, Mike Duigou wrote:

Hello all;

Currently Collections.sort() refuses to sort the lists which result from calling Collections.singletonList(). This makes some sense because the singleton lists are immutable but they are also alway sorted. This patch allows Collections.sort() to be used with empty and singleton lists of all types. A short circuit return is provided for lists of length 0 and 1 as they are already sorted. WEBREV: http://cr.openjdk.java.net/~mduigou/7065380/0/webrev/ For the unit test ignore the diffs and view the "New" file--webrev doesn't understand "hg copy". Thanks, Mike

Is it not better to check list.size() before calling toArray() ?

Rémi



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