[PR] refactor: apply misc Java 11-17 improvements [pekko]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin opened a new pull request, #3193:
URL: https://github.com/apache/pekko/pull/3193

   ## Summary
   - `String.isBlank()` replacing `trim().isEmpty()`
   - `Collection.toArray(IntFunction)` replacing `toArray(new X[0])`
   - `Map.forEach` replacing entrySet iteration loops
   - Text blocks `"""..."""` replacing multi-line string concatenation
   - Records replacing simple data holder classes
   
   ## Changes
   
   ### String.isBlank() (Java 11+)
   - `ShardingEventSourcedEntityWithEnforcedRepliesCompileOnlyTest.java`
   
   ### Collection.toArray(IntFunction) (Java 11+)
   - `GraphDslTest.java` — `toArray(new String[] {})` → `toArray(String[]::new)`
   - `BidiFlowDocTest.java` — `toArray(new Message[0])` → `toArray(Message[]::new)`
   
   ### Map.forEach (Java 8+)
   - `ReplicatedShoppingCartExample.java` — entrySet loop → `cart.forEach((k, v) -> ...)`
   - `DeviceGroupQuery.java` — entrySet loop → `deviceIdToActor.forEach((k, v) -> ...)`
   
   ### Text blocks (Java 15+)
   - `SubstreamDocTest.java` — 3-line string concat → text block
   - `TestConfigExample.java` — config string concatenations → text blocks
   
   ### Records (Java 16+)
   - `ImmutableMessage.java` → `record ImmutableMessage(int sequenceNumber, List<String> values)`
   - `Messages.java` inner class → record
   - `Message.Person` → `record Person(String first, String last)`
   - `Bid.java` → `record Bid(UUID bidder, Instant bidTime, int bidPrice, int maximumBid)`
   - Updated callers in `AuctionEntity.java` and `AuctionState.java` (getter names adjusted)
   
   ## Notes
   - All changes in test/doc/example code only, no production API modifications
   - `javafmtAll` verified — no formatting changes needed


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Re: [PR] refactor: apply misc Java 11-17 improvements [pekko]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin merged PR #3193:
URL: https://github.com/apache/pekko/pull/3193


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