Passed 1Z0-829

Hello,
I passed 1Z0-829 with 92% yesterday. I would say that the exam itself is not hard to pass, but the preparation for it is pretty hard(at least time consuming ...). I passed 1Z0-819 as well 2 years ago with 89% but i had to study for 6 moths to be sure that i will pass the 819. And now, approximately 2 months for 829 ... I used the well known sources - OCP Oracle Certified Professional Java SE 17(11) Developer Study Guide (Scott Selikoff; Jeanne Boyarsky) + enthuware mock exams.

I am not going to talk about the 819 because it was 2 years ago, and I took it in test centre...

As you all already know, the only way to pass 829 is from home - using the online proctored environment delivered by Oracle. It is a web based environment very similar to the enthuvare on-premise test java client.
The main difference is, what i observe,  that you are able to select more answers that it is mentioned in the question - I noticed it by coincidence, but you should be aware of it (I did not try to click on next button [so maybe some alert window would pop up and inform you about that] - but in Enthuware it does not let you select more - so it is a difference).
The another I think pretty important point is - I was allowed to use paper + pen - I explicitly asked proctor If i can use paper and pen and he allowed it. So don't hesitate to use it, but i strongly advice you to let them know via chat
Some questions were pretty long, but usually 1 or 2 correct answers. Strangely - one question i would say had more correct answers that it was mentioned in question ...
The question was like - there was a sealed interface which permitted 2 classes/interfaces (lets say A and B) and they asked how many answers would compile - only 2 answers were correct according to Oracle but for me it looked like there are at least 3 correct answers So I selected two which i thought are among the correct  (2 non-sealed interfaces which were mentioned in permits clause and extended the sealed interface - ) - I personally think that final class A and a non-sealed abstract class B were also correct answers (both were implementing the sealed interface).

Another pretty strange question was about binary search in list ... The question was asking what would be the output when the code is compiled and run ? ...
This is pretty much how the code looked like :
public static void main(String[] args) {        var list = Arrays.asList("g1", "g3", "g2");        System.out.print(Collections.binarySearch(list, "g3"));        Collections.sort(list);        System.out.print(Collections.binarySearch(list, "g3"));        Collections.reverse(list);        System.out.print(Collections.binarySearch(list, "g3"));    }

and there were multiple answers (only one was correct) ... There were only concrete answers - for example (A,111) (B,122)(C, 12-4). I would say, that if the list is not sorted in natural way (in this case), then the result is not defined (at least not for the first and the last output in this case) ... But the correct answer was 12-4 I believe ...

And last strange moment i remember was that one question i had was pretty same as I got in Enthuware. So dunno if Oracle was inspired by Enthuware mock questions or vice versa

And thats it, i hope you find this useful and sorry if my English does not sound like a native one )

Congratulations! ...and thank you for sharing your experience.

Congratulations, Jur! Great score!!

Congratulations Please add your name here.

Thanks for sharing your experience. Mine was same. Same questions i got stuck. But i taken %64 unfortunately. I guess i am gonna prepare another $245

Jur Aj wrote:. . . but usually 1 or 2 correct answers.

That surprises me; there should only be one correct answer, or they should say there may be several correct answers.

. . . about binary search . . . if the list is not sorted . . . the result is not defined . . .

Yes, Collections#binarySearch() does say the result is undefined for a List not sorted in ascending order. If the elements aren't mutually comparable, it throws an exception.
I ran your code on JShell and got C:-

jshell> var list = Arrays.asList("g1", "g3", "g2");
  ...>         System.out.print(Collections.binarySearch(list, "g3"));
  ...>         Collections.sort(list);
  ...>         System.out.print(Collections.binarySearch(list, "g3"));
  ...>         Collections.reverse(list);
  ...>         System.out.print(Collections.binarySearch(list, "g3"));
  ...>
list ==> [g1, g3, g2]
12-4

If they suggested that as an answer, they should not also say, “undefined,” even if that is a better answer, otherwise there would be two “correct” answers.
In the case of your line 7, the “insertion point” is one to the right of the whole List, which is 3, so the last output becomes −4.

Jur Aj wrote:
The another I think pretty important point is - I was allowed to use paper + pen - I explicitly asked proctor If i can use paper and pen and he allowed it. So don't hesitate to use it, but i strongly advice you to let them know via chat

Is it possible the proctor was new and unfamiliar with the rules?
I am really surprised. They are very strict about removing all papers far away.
I remember they explicitly say that you cannot use your own writing instruments and paper.
(after all, it will help you copy qs to help others!)
I think only the test centers allow a dry erase pad that they will provide.
Can anyone else confirm if they are allowing writing on the online exam that we take from home?

I find it surprising as well, but a number of people reported being allowed to use pen/paper at home.

Jeanne Boyarsky wrote:I find it surprising as well, but a number of people reported being allowed to use pen/paper at home.

Thanks for the confirmation. It is important as one wastes time trying to hold all the information in one's head e.g. questions that require juggling garbage collection references.

Congratulations! very good!!! 92%!! Excelent

Maybe I can explain a little bit about the answer 12-4.
The binaurySearch starts in the middle. By "accident" it finds there "g3", So it will print1
When the list is sorted, than the 2 is correct index for "g3", 2 will be printed.
When a list is reversed the book is saying, "a binarySearch will be undefined". -4 means undefined? but it sounds strange for me.

(It is not the case here, but when you search in a sorted list and it is not in the list where you are searching for, then it should be the complement of the index were it should be placed in the list -1, the index is than negative.)

You are expected to know that the documentation for binarySearch() (both overloadings of the name) says that the List must be sorted in ascending order and the results are undefined for an unsorted List. That is why “undefined” is the correct answer.

Congratulations on passing the 1Z0-829 exam with such a high score! It sounds like you put a lot of hard work and dedication into your preparation, and it definitely paid off. It's good to know that the exam itself is not too difficult, but it does require a lot of studying and time. Thank you for sharing your experience with us and giving others an idea of what to expect when preparing for this exam.

Anil Philip wrote:

Jur Aj wrote:
The another I think pretty important point is - I was allowed to use paper + pen - I explicitly asked proctor If i can use paper and pen and he allowed it. So don't hesitate to use it, but i strongly advice you to let them know via chat

Is it possible the proctor was new and unfamiliar with the rules?
I am really surprised. They are very strict about removing all papers far away.
I remember they explicitly say that you cannot use your own writing instruments and paper.
(after all, it will help you copy qs to help others!)
I think only the test centers allow a dry erase pad that they will provide.
Can anyone else confirm if they are allowing writing on the online exam that we take from home?

Can't tell anything about proctors expertise ... obviously ) but anyway i found topic on https://community.oracle.com/ou/discussion/comment/2928#Comment_2928.
So as soon as you inform proctor that you are gonna use paper for calculations etc, and he allows it,  then everything should be ok ...

Campbell Ritchie wrote:

Jur Aj wrote:. . . i found topic on . . .

Please check; I couldn't get that link to open.

It is allowed to have a papersheet and pencil for the exam certification?
Accepted Answer
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Comments
Charlie Gamboa H
Charlie Gamboa H Posts: 2
March 2023
Hi guys, I'm about to take the Java Programmer 1 1Z0-808 I'm just wondering, Could it be a good idea having a notebook nearby just in case, to do some calculations??

Thanks for your thoughts.

Best Answer
TanuG-Oracle
TanuG-Oracle Posts: 38 Explorer
March 2023
Please inform proctors via zoom chat if you are using paper and pen only for calculations.

screenshot is attached