About Question enthuware.ocajp.i.v8.2.1379 :

[haquim]

Since line 2 and 3 have the same option, the compiler will send and error on both lines; not only line 3. So I think the correct options would be
Compilation error because of //1
Compilation error because of //2
Compilation error because of //3

[admin]

Well, the duplicate value occurs at //3 and not at //2. So there will be no error if you fix //1 and //2.

HTH,
Paul.

[bomicbon]

error on duplicate case? SADBOYZ

[admin]

Yes, that is why option 4 is the correct option.

[cristibctr]

While the answers are valid I think the explanation for the last answer is not quite right. This is not a switch expression but a switch statement since it doesn't return a value.

At least as far as I understand from the jls both a switch expression and a switch statement have the same definition " switch ( Expression ) SwitchBlock " though the former is only allowed when assigning to a variable or using it to return something.

Another way to test if the explanation is right is by assigning the result of the switch in this question to a variable thus getting a compilation error with the message "attempt to break out of a switch expression". So no, you cannot use break in a switch expression.

[admin]

Yes, I see point 3. in the explanation (in 1z0-829 question bank):

3. Observe that this is a valid way to write a switch statement using the new arrow syntax.

Please make sure you are using the most recent version of the question bank.

[MichaelZett]

Hi,
in the explanation it reads "2. Adding underscores doesn't actually change the number. The compiler ignores the underscores. So 1_000_000 and 1000000 are actually same and you cannot have two case blocks with the same value. Therefore, the second case at //3 is invalid."

It should be " at //4", correct?

[admin]

Yes, for the question 2.3218 in 1z0-829 question bank it should be //4.