Re: ambiguous questions for JCP ?

"Daniel Pitts" <>
13 Nov 2006 09:59:24 -0800
Andreas Leitgeb wrote:

I'm currently studying for the "Java certified programmer", and
some book (whose authors claim to have had some deeper insight
into the official certification questions) offers sample questions.

Some are dependent on unspecified context:
1.) int myvar = abcd; <-- is this legal ?
In my mind, it is syntactically legal. However it depends on
that an int-compatible variable named "abcd" is in some way
visible at this point (e.g. even through static import).

The answers are usually multiple choice, and that gives you enough
context to answer correcty. At least on the practice exams I've taken.

2.) "if obj is an instance of Object ..." then follows a question
whose answer depends on whether obj is really only Object (and not
more). For any object, (object instanceof Object) is true, after all.

Other questions are actually unambiguous, but answered wrongly in
the answers-section of said book:

  char ch = 0x1234; is supposedly wrong, because unicode-literals
                 must be given in single quotes. - but it's correct,
                 since char can also be initialized with appropriate
From my understanding, the JCP doesn't ask about bad-style/practices,

only valid syntax.

  enum E { A, B, C } is supposedly wrong, because a semicolon is
                 missing after the last instance - but javac (and
                 docs) say it's correct so.

The semicolon is actually optional, and is only needed if you are
adding members to the base enum class E. Remember, enums are classes,
and each value has its own class, and therefor can have its own

enum E { A { int aInt; }, B, C; int eInt; E() { eInt = ordinal() + 1; }
is valid as well as
enum E { A }

Can I assume that the questions on the real exam are unambiguous,
or do I have to look forward to just guess the context for some
questions, or am I better off learning by heart some answers (like
for above examples), despite knowing the answer is really wrong?

If I find a suspicious question during the real exam, and
then find I've got too little percentage in the corresponding
section, would it be feasible to question the result?

Well, this might just be the blind leading the blind, as I haven't
taken the cert yet myself, but hopefully I've answered your questions
correctly. Good luck.


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