<AWT Dev> [9] Review Request: JDK-8037912 Use StringJoiner in client classes

[Petr Pchelko]

Hello, AWT team.

Please review a simple cleanup fix for the issue: https://bugs.openjdk.java.net/browse/JDK-8037912
The fix is available at: http://cr.openjdk.java.net/~pchelko/9/8037912/webrev/

Recently I’ve found out that a new StringJoiner class was added to JDK 8 and wanted to try that out.

With best regards. Petr.