8264428: Cleanup usages of StringBuffer in java.desktop

[turbanoff]

There are few possible cleanups in java.desktop related to legacy StringBuffer usages:

1. In few places StringBuffer can be replaced with plain String concatenation.
2. StringBuffer can be replaced with StringBuilder. StringBuilder has better performance as it is not thread-safe.
3. There are few places where result of string concatenation is passed to StringBuffer.append method. Using separate .append calls is more clear.
4. In few places primitives are unnecessary converted to String before .append call. They can be replaced with specialized methods (like .append(int) calls.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8264428: Cleanup usages of StringBuffer in java.desktop

Reviewers

• Alexander Zvegintsev (@azvegint - Reviewer)
• Alexey Ivanov (@aivanov-jdk - Reviewer)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/3251/head:pull/3251
$ git checkout pull/3251

Update a local copy of the PR:
$ git checkout pull/3251
$ git pull https://git.openjdk.java.net/jdk pull/3251/head

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$ git pr checkout 3251

View PR using the GUI difftool:
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https://git.openjdk.java.net/jdk/pull/3251.diff

[bridgekeeper]

👋 Welcome back turbanoff! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@turbanoff The following labels will be automatically applied to this pull request:

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• awt
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[shipilev]

Submitted: https://bugs.openjdk.java.net/browse/JDK-8264428, please rename PR to "8264428: Replace uses of StringBuffer with StringBuilder in java.desktop".

[mlbridge]

Webrevs

• 03: Full - Incremental (d083f953)
• 02: Full - Incremental (963dc56e)
• 01: Full - Incremental (80bff1db)
• 00: Full (9bd4e523)

[mrserb]

Looks like this change goes beyond of simple replacement of StringBuffer with StringBuilder. Please update the description of the bug and PR description.

[turbanoff]

I've updated PR description, but I don't have rights to update JIRA.

[shipilev]

I updated the bug synopsis in JIRA.

[openjdk]

@turbanoff This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8264428: Cleanup usages of StringBuffer in java.desktop

Reviewed-by: azvegint, aivanov

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 130 new commits pushed to the master branch:

• 81d35e4: 8264063: Outer Safepoint poll load should not reference the head of inner strip mined loop.
• 04fa1ed: 8264848: [macos] libjvm.dylib linker warning due to macOS version mismatch
• 214d6e2: 8263506: Make sun.net.httpserver.UnmodifiableHeaders unmodifiable
• af13c64: 8264711: More runtime TRAPS cleanups
• 3aec2d9: 8264718: Shenandoah: enable string deduplication during root scanning
• 255afbe: 8264672: runtime/ParallelLoad/ParallelSuperTest.java timed out
• ec599da: 8264633: Add missing logging to PlatformRecording#stop
• e89542f: 8264352: AArch64: Optimize vector "not/andNot" for NEON and SVE
• 016db40: 8263907: Specification of CellRendererPane::paintComponent(..Rectangle) should clearly mention which method it delegates the call to
• 78d1164: 8214455: Relocate CDS archived regions to the top of the G1 heap
• ... and 120 more: https://git.openjdk.java.net/jdk/compare/a5d7de235101696463dba22792703c6809ff7fc4...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@azvegint, @aivanov-jdk) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[turbanoff]

/integrate

[openjdk]

@turbanoff
Your change (at version d083f95) is now ready to be sponsored by a Committer.

[azvegint]

/sponsor

[openjdk]

@azvegint @turbanoff Since your change was applied there have been 132 commits pushed to the master branch:

• 308f679: 8264454: Jaxp unit test from open jdk needs to be improved
• 5bd6c74: 8236127: Use value of --icon CLI option to set icon for exe installers
• 81d35e4: 8264063: Outer Safepoint poll load should not reference the head of inner strip mined loop.
• 04fa1ed: 8264848: [macos] libjvm.dylib linker warning due to macOS version mismatch
• 214d6e2: 8263506: Make sun.net.httpserver.UnmodifiableHeaders unmodifiable
• af13c64: 8264711: More runtime TRAPS cleanups
• 3aec2d9: 8264718: Shenandoah: enable string deduplication during root scanning
• 255afbe: 8264672: runtime/ParallelLoad/ParallelSuperTest.java timed out
• ec599da: 8264633: Add missing logging to PlatformRecording#stop
• e89542f: 8264352: AArch64: Optimize vector "not/andNot" for NEON and SVE
• ... and 122 more: https://git.openjdk.java.net/jdk/compare/a5d7de235101696463dba22792703c6809ff7fc4...master

Your commit was automatically rebased without conflicts.

Pushed as commit 8a23580.

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