RFR: 8297682: Use Collections.emptyIterator where applicable

[Pavel Rappo]

On Mon, 7 Nov 2022 17:30:20 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Instead of `Collections.emptyList().iterator()` we can use `Collections.emptyIterator()` method.
> Actual implementation of `java.util.Collections.EmptyList#iterator` does exactly this - just calls `emptyIterator` method.

src/java.base/unix/classes/sun/nio/fs/UnixFileSystem.java line 192:

> 190:                     return allowedList.iterator();
> 191:                 } catch (SecurityException x) {
> 192:                     return Collections.emptyIterator(); //disallowed

Alternatively, you could use the exception parameter to capture that comment:

    } catch (SecurityException disallowed) {

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PR: https://git.openjdk.org/jdk/pull/11025