[jdk11u-dev] RFR: 8333837: [11u] HexPrinterTest.java javac compile fails illegal start of expression [v2]

[SendaoYan]

> Hi all,
>   The testcase `test/lib-test/jdk/test/lib/hexdump/HexPrinterTest.java` fails because of Java 11 doesn't support `var v = switch(String) { case String -> ... }` syntax. This testcase was backported by [JDK-8329248](https://bugs.openjdk.org/browse/JDK-8329248) from jdk15. This PR fix the syntax error to make the testcase work normally.
>   Only change the testcase, the change has been verified, no risk.

SendaoYan has updated the pull request incrementally with one additional commit since the last revision:

  revert the copyright year change

-------------

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2750/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2750/files/a95f8fcd..873c017c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2750&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2750&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2750.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2750/head:pull/2750

PR: https://git.openjdk.org/jdk11u-dev/pull/2750