Enthuware

Hi,

The question in this issue is incorrect.
I can't get list in order [amy, Adam, audrey] via the proposed options.

[amy, audrey, Adam] - original list
[Adam, amy, audrey] - standart sorting
[audrey, amy, Adam] - reverse soring. The correct answer suggest this option, but it is not [amy, Adam, audrey]

Please check

Regards,
Alex

Did you run the code exactly as given? There is a space in front of " audrey". The explanation also mentions the following:

In case of String elements, the natural order is: space < upper case < lower case. Here, the output is expected to be in reverse order, therefore, we need a reverse order Comparator. Collections.reverseOrder() returns such a comparator.

Ohh, see now.
I haven't attach any importance to this.

Thanks,
Alex

public static List getNameList() 

gives the expected result, but is evaluated as "invalid".

Hey there,

I was just wondering why List<String> is the only accepted answer for the first part when List will return the same output? Is it to do with type erasure?

Thanks,

Leimodnunewra

Because in the main method the return value is being assigned directly (without any cast) to List<String>. Did you try the code with just List instead of List<String>?

Yes, I did. I got the same result that I had gotten when using List<String> which is why I am curious about the given answer.

I get the following warning if I don't use List<String>:
Note: TestClass.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

I don't get any warnings at all, it runs as if I had used List<String>, that's strange. Thank you for your help though.

Edit:
I had to clean and build the project to get the warnings to show up, I will try this in future.

There is some missleading in the explanation:

3. Collections.sort(collection) method sorts the elements of the given collection in the natural order of it elements.

Method Collections.sort takes argument of type List<T> but not a collection
So should be:
Collections.sort(List<T> list)

admin wrote:Did you run the code exactly as given? There is a space in front of " audrey". The explanation also mentions the following:

In case of String elements, the natural order is: space < upper case < lower case. Here, the output is expected to be in reverse order, therefore, we need a reverse order Comparator. Collections.reverseOrder() returns such a comparator.

OH MY LORD!!! Pffffffff, I could NOT for the life of me figure out this thing, as I knew that none of the code would return the right order, following the rules of natural sorting.

Did NOT see the extra space in front of audrey............

I had 30 minutes left to spare in the test, and spent it almost entirely on this 1 question... should have just finished the test and checked the answer!!!

Well played Paul, well played!

Cheers,
Dieter