RFR: 8274496: Use String.contains() instead of String.indexOf() in java.desktop

[Sergey Bylokhov]

On Fri, 17 Sep 2021 15:46:51 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> String.contains was introduced in Java 5.
> Some code in java.desktop still uses old approach with String.indexOf to check if String contains specified substring.
> I propose to migrate such usages. Makes code shorter and easier to read.

Marked as reviewed by serb (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5565