Enthuware

Can anyone explain why it is fine to put
"public enum X{ X1,X2,X3}" in the first line and "enum Y{Y1,Y2,Y3}" in the second box and it is not fine to do the oposite?
Thank you.

It is the reverse that you can't do because you can't have two public classes (or enums/interfaces) in the same file. (Except if they are inner classes/enums/interfaces.)

Good day.
Why does the answer is wrong? The code is compiling and running well.

Unless mentioned otherwise, you need to fill all the yellow targets.

At point 1 of the exaplanation for this question is said:

1) Enum constructor is always private. You cannot make it public or protected. If an enum type has no constructor declarations, then a private constructor that takes no parameters is automatically provided.

Is the first statement actually true?
I mean, I'm reading some cert books and I saw some code snippets where enum constructor had default access modifier.
Agree though they cannot have public or protected.
Thanks for the clarification.
Marco

Yes, the given statement is correct.
default is not an access modifier. When there is no access modifier, that means it is default access.
For example,
class SomeClass{
default int x; <- this is invalid because default is not a valid access modifier
int y; <- this is valid and since there is no access modifer for y, it has default access.
}

In case of enums, when there is no access modifier for the constructor, it is considered private, that means default is private.

Thank you very much. The point I was missing was exactly the last statement

If no access modifier is specified for the constructor of an enum type, the constructor is private.

http://docs.oracle.com/javase/specs/jls ... #jls-8.8.3
This is a different behavior from "normal" classes constructors.
Point to remember.