sjhajharia opened a new pull request, #20096:
URL: https://github.com/apache/kafka/pull/20096

   Now that Kafka support Java 17, this PR makes some changes in tools
   module. The changes in this PR are limited to only some files. A future
   PR(s) shall follow.
   The changes mostly include:
   
   - Collections.emptyList(), Collections.singletonList() and
   Arrays.asList() are replaced with List.of()
   - Collections.emptyMap() and Collections.singletonMap() are replaced
   with Map.of()
   - Collections.singleton() is replaced with Set.of()
   
   Some minor changes to use the enhanced switch.
   
   Sub modules targeted: tools/src/test


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