Enthuware

Posted: **Mon Dec 14, 2015 10:51 am**

I'm working on Java 1.8.0_45.

Files.newInputStream(Path path, OpenOption... options)

invokes

Code: Select all

FileSystemProvider.newInputStream(Path path, OpenOption... options)

where you can find

Code: Select all

            for (OpenOption opt: options) {
                // All OpenOption values except for APPEND and WRITE are allowed
                if (opt == StandardOpenOption.APPEND ||
                    opt == StandardOpenOption.WRITE)
                    throw new UnsupportedOperationException("'" + opt + "' not allowed");
            }

In fact, all the five options compile in my jre/os. Anyway, being there hardcoded in the class, I think it can be considered a general rule in case of reading.

Posted: **Wed Mar 09, 2016 5:45 pm**

Regarding option 4, I get

Code: Select all

UnsupportedOperationException: 'APPEND' not allowed

whether the file already exists or not.

Posted: **Wed Mar 09, 2016 5:54 pm**

And option 5 executes fine if the file exists. I'm on Windows.

Posted: **Wed Mar 09, 2016 11:21 pm**

Fixed.
thank you for your feedback!
Paul.

Posted: **Thu Mar 10, 2016 4:36 am**

We have correct answer

new OpenOption[]{StandardOpenOption.READ, StandardOpenOption.DELETE_ON_CLOSE}

and that explanation:

Thus, READ and TRUNCATE_EXISTING (or WRITE, APPEND, or DELETE_ON_CLOSE) cannot go together.

one excludes other

Posted: **Thu Mar 10, 2016 9:37 am**

Unfortunately, it works on Java 8 but does not work on Java 7. So the option is marked as correct for Java 8 version and wrong for Java 7.
The explanation has now been updated accordingly.

thank you!
Paul.

Posted: **Thu Mar 10, 2016 10:08 am**

That explains! Thanks for checking.

Enthuware

About Question enthuware.ocpjp.v8.2.1552 :

About Question enthuware.ocpjp.v8.2.1552 :

Re: About Question enthuware.ocpjp.v8.2.1552 :

Re: About Question enthuware.ocpjp.v8.2.1552 :

Re: About Question enthuware.ocpjp.v8.2.1552 :

Re: About Question enthuware.ocpjp.v8.2.1552 :

Re: About Question enthuware.ocpjp.v8.2.1552 :

Re: About Question enthuware.ocpjp.v8.2.1552 :