On Fri, 24 Mar 2023 07:21:27 GMT, Sergey Bylokhov <s...@openjdk.org> wrote:
>> Behavior is the same.
>> `Enumeration` doesn't have `remove` method. Only `hasMoreElements` and
>> `nextElement`.
>> Method creates a new collection for result each time, hence no updates of
>> underlying collection are possible.
>> Iteration order is the same too.
>>
>> Vector<String> v = new Vector<>();
>> v.add("123");
>> v.add("444");
>> v.add("555");
>> v.add("666");
>>
>> Enumeration<String> elements = v.elements();
>> while (elements.hasMoreElements()) {
>> String s = elements.nextElement();
>> System.out.println(s);
>> }
>> System.out.println();
>>
>> ArrayList<String> a = new ArrayList<>(v);
>> Enumeration<String> e = Collections.enumeration(a);
>> while (e.hasMoreElements()) {
>> String s = e.nextElement();
>> System.out.println(s);
>> }
>>
>> gives
>>
>> 123
>> 444
>> 555
>> 666
>>
>> 123
>> 444
>> 555
>> 666
>
> but there is an asIterator method that may support remove
`Vector.elements()` and `Collections.enumeration(ArrayList)` returns
`Enumeration` implementations that don't override `asIterator` method. Default
implementation `java.util.Enumeration#asIterator` doesn't support remove too.
So, we are safe here.
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/13149#discussion_r1147979096
