RFR: JDK-8297299 SequenceInputStream should not use Vector [v5]

[Markus KARG]

On Mon, 21 Nov 2022 06:31:47 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> While we are at it, would you be willing to change the member variables `e` to `private final` and the `in` to `private`? From what I can see, I don't see any other class accessing these package private fields.

Good catch, will do later today.

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PR: https://git.openjdk.org/jdk/pull/11249