RFR: 8289389: Fix warnings: type should also implement hashCode() since it overrides Object.equals() [v5]

[Andy Goryachev]

> - added missing hashCode() methods

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

  8289389: review comments

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/821/files
  - new: https://git.openjdk.org/jfx/pull/821/files/dd9e60a7..530bdd98

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=821&range=04
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=821&range=03-04

  Stats: 6 lines in 3 files changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/821.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/821/head:pull/821

PR: https://git.openjdk.org/jfx/pull/821