About Question enthuware.ocpjp.v7.2.1340 :

[Student]

Looking forward to the answer to this one, seeing as all five of the options compile

[admin]

Did you read the detailed explanation provided with it?

Mere successful compilation is not the objective here.

[Student]

Hi,
No; at the time I was still doing the test (I work through each question, coding examples and testing them (as necessary i.e. in the event of any doubt) as I go, which means I learn twice: once as I take the "test" and again as I recap in going through all the answers). I
I knocked up a small test program for all the possible answers because it seemed to me that all of the options "may" be inserted, by which I take/took to mean, if they are inserted, compilation will not fail. The question should be more precise (I hate saying this because you guys do an amazing job but I have to be honest about the question): "may be inserted" is not the same as "compiles and runs without exception and satisfies the equals() contract", or even just "satisfies the equals contract". It's just a bit...ambiguous
Cheers.

[admin]

The problem statement has been modified to make it clear now.

Thank you for your feedback!