Use lambda expression instead of anonymous inner class

[wenshao]

This is a small improvement, no change in logic, just a common programming style change, using Lambda instead of anonymous inline class.

Most of the line changes here are due to indentation, and there are no logical changes.

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Progress

• [ ] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [x] Change must not contain extraneous whitespace
• [ ] Commit message must refer to an issue

Reviewing

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$ git fetch https://git.openjdk.org/jdk.git pull/19234/head:pull/19234
$ git checkout pull/19234

Update a local copy of the PR:
$ git checkout pull/19234
$ git pull https://git.openjdk.org/jdk.git pull/19234/head

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$ git pr checkout 19234

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https://git.openjdk.org/jdk/pull/19234.diff