RFR: 8266571: Sequenced Collections [v4]

[Rémi Forax]

On Wed, 29 Mar 2023 19:06:20 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Stuart Marks has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Simplify handling of cached keySet, values, and entrySet views.
>
> src/java.base/share/classes/java/util/SequencedCollection.java line 107:
> 
>> 105:      */
>> 106:     default void addFirst(E e) {
>> 107:         throw new UnsupportedOperationException();
> 
> Can this be defaulted to `this.reversed().addLast()` instead? If this throws uoe, the reversed should throw uoe as well; and the new default can simplify implementations by much as well.

In the same spirit, `reversed()` should also have a default implementation equivalent to

  Collections.unmodifiableSequenceCollection(Arrays.asList(this.toArray())).reversed()

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PR Review Comment: https://git.openjdk.org/jdk/pull/7387#discussion_r1152384938