Enthuware

Hi, while I was taking the second standard test I independently came up with the same solution as described in the following, marked as resolved, bug/error: viewtopic.php?f=38&t=4055
The software marked my answer as incorrect, but according to the aforementioned topic (and the compiler) it probably should be marked as correct. I also reproduced this problem by creating and taking a custom test containing only this one question. Maybe I didn't use the drag'n'drop tool correctly, or maybe there is a regression bug in this question.

Maybe a mistake in the explanation:

3. You cannot instantiate a Collection because it is an abstract class

But Collection is an interface.

jankur wrote:Hi, while I was taking the second standard test I independently came up with the same solution as described in the following, marked as resolved, bug/error: viewtopic.php?f=38&t=4055
The software marked my answer as incorrect, but according to the aforementioned topic (and the compiler) it probably should be marked as correct. I also reproduced this problem by creating and taking a custom test containing only this one question. Maybe I didn't use the drag'n'drop tool correctly, or maybe there is a regression bug in this question.

Yes, I see the problem. The issue is that it is opening up too many possibilities of correct options. So I have reduced one yellow target to avoid the solution that doesn't using E. See attachment.
I hope this fixes it for good.

-Paul.

thodoris.bais wrote:Maybe a mistake in the explanation:

3. You cannot instantiate a Collection because it is an abstract class

But Collection is an interface.

You are right. Fixed.

thank you for your feedback!

No worries, Paul, I'm trying to prepare myself for this complex exam.

On topic, watching again the question itself for the second time, I am not sure I understand why the method signature has to be defined like that (or, to phrase it better, why the following is allowed by the compiler):

public < E  extends CharSequence > Collection < E >  getWordsStartingWith( Collection< E > input , char ch ) { }

I mean, to my understanding, the above is only clear like that:

public Collection < E extends CharSequence >        getWordsStartingWith( Collection< E > input , char ch ) { }

So, the question is: what is so special about the

< E  extends CharSequence >

declaration between the access modifier and the return type of the method?

Am I missing a language specification?

Yes, that is the syntax. Before you can use E in the method, you need to specify two things - 1. That you are going to use E as a the generic type . and 2. That E extends CharSequence.

That is why <E extends CharSequence> is needed before the return type.

I'm unable to grab hold of the E in the drag & drop question. The other terms work fine.

I find it odd no one else reported this, so I'm guessing it's something on my end, but I can't figure out what I'm doing wrong. The hover message does appear when I hover over the E, but I can't pick it up. I've tried dragging from slightly above/below or to the side of the E, but nothing seems to be working.

This with Enthuware Test Studio v3.93, build: 20180516 on Windows 10, Java 10.0.2.


EDIT: When I add other terms to my solution and then click the E, the solution is reset and all fields are blank again. This is very odd...

Hi Rick,
Could you please replace your question bank file with the latest one from http://enthuware.com/downloads/jqplusv8.ets and see if that fixes the problem?

thank you,
Paul.

That fixed it, thank you!