Integrated: 8300866: Declare some classes final in java.io

[Per Minborg]

On Mon, 23 Jan 2023 14:40:50 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes declaring some internal classes in java.io as `final`, explicitly indicating that they are not intended for sub-classing. 
> 
> If you think declaring classes final is just "static noice", please see http://minborgsjavapot.blogspot.com/2021/12/why-general-inheritance-is-flawed-and.html first and then come back and comment on the issue.

This pull request has now been integrated.

Changeset: d1173508
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/d11735087507a17204bd81ae565409a3b7e881ae
Stats:     15 lines in 5 files changed: 1 ins; 3 del; 11 mod

8300866: Declare some classes final in java.io

Reviewed-by: alanb

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PR: https://git.openjdk.org/jdk/pull/12141