RFR: 8274168: Avoid String.compareTo == 0 to check String equality in java.management [v2]

[Andrey Turbanov]

> Cleanup places, where String.compareTo is used to check String's equality.
> Instead String.equals or switch expression could be used. They are faster and code is cleaner.

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

  8274168: Avoid String.compareTo == 0 to check String equality in java.management
  call compareTo only once

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5640/files
  - new: https://git.openjdk.java.net/jdk/pull/5640/files/ce8f707e..bf974634

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5640&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5640&range=00-01

  Stats: 6 lines in 1 file changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5640.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5640/head:pull/5640

PR: https://git.openjdk.java.net/jdk/pull/5640