Java Valid identifier

Question

I am preparing for my school test and i have a Simple question:

Which of the following is a VALID identifier?
a. this
b. that
c. int
d. double
e. not of the above

I think the answer is b.that do you agree and why?

Hint: some words are *reserved* ones. For instance, you can't call a variable *class* — Dmitry Bychenko, Aug 26 '15 at 07:27
How about testing it? Declare a variable with each of these names, and see which compile and which not, and you'll have your answer. — JB Nizet, Aug 26 '15 at 07:27
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/_keywords.html — Dmitry Bychenko, Aug 26 '15 at 07:29
Funny thing is that SO actually kind of highlighted the correct answers in blue.. as they are part of `code` — Phantomazi, Aug 26 '15 at 07:29
Specifications of Java identifiers [JLS 3.8 Identifiers](http://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.8) — Tobías, Aug 26 '15 at 07:31
there is a good question hidden somewhere deep inside this question, hidden under the fact that this is homework and that it is put in a multiple choice form. But the question "what makes a valid Java identifier?" would be a good one. — flup, Aug 26 '15 at 07:34
@Phantomazi Actually it highlighted the incorrect answers in blue. — Kayaman, Aug 26 '15 at 07:40

score 1 · Answer 1 · answered Aug 26 '15 at 07:32

1

Your answer:

a. that

In java you are not allowed to use keywords as identifiers.

this

is a keyword for pointing to current object

int

is a keyword for primitive integer type

double

is a keyword for primitive double type.

P.S: You are not supposed to ask questions, without research and efforts. I am not supposed to promote such questions by answering...:)

answered Aug 26 '15 at 07:32

user1933888

hey thank you very much, a little confuse with ton of information available online. just need some clear guide line – Learningasigo Aug 26 '15 at 07:56

1 Answers1