RFR: 8315952: Open source several Swing JToolbar JTooltip JTree tests [v2]

[Alexey Ivanov]

On Tue, 19 Sep 2023 16:02:21 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

> Better to close the stream objects in finally block in case of Exception.
> 
> ```
> finally  {
>      if (oos != null) {
>          oos.close();
>      }
>      if (ois != null) {
>           ois.close();
>      }
>   } 
> ```

No, *it's not better.* If `oos.close()` throws an exception, then `ois` is left open. In addition to that, any exception thrown from the finally block will replace the exception thrown from the try block.

*The best way is using [**try-with-resources**](https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html)*: it handles all the above correctly.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15755#discussion_r1330381649