What is `Cleaner` API in Java 9+ and how does it improve over `finalize()`?

Java Professional Hard

Java Professional — Hard

What is `Cleaner` API in Java 9+ and how does it improve over `finalize()`?

Key points

  • Cleaner API registers cleanup actions for phantom-reachable objects
  • Avoids performance and ordering problems of finalize()
  • Does not resurrect the object after cleanup
  • Cleaner is not a replacement for garbage collection or a faster version of finalize()

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