RFR: 8298567: Make field in RandomAccessFile final

[Alan Bateman]

On Mon, 12 Dec 2022 12:48:47 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes making a field in `RandomAccessFile` final. Also, it modernises a switch statement.

Surprising that RandomAccessFile.fd was not changed to final many years ago. We can do rw at the same time.

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PR: https://git.openjdk.org/jdk/pull/11632