About Question enthuware.ocajp.i.v7.2.1268 :

[ETS User]

In the answer it says that option 3 is wrong because 'i' is not initialized, however aren't all primitives initialized to 0?

[admin]

No, local variables (i.e. variables in a method) are not initialized automatically. Only instance and static variables are initialized automatically.

HTH,
Paul.

[Ambiorix]

No, local variables (i.e. variables in a method) are not initialized automatically. Only instance and static variables are initialized automatically.

HTH,
Paul.

How do we know that this is in a method given that we can only see 2 lines of code?

[admin]

No, local variables (i.e. variables in a method) are not initialized automatically. Only instance and static variables are initialized automatically.

HTH,
Paul.

How do we know that this is in a method given that we can only see 2 lines of code?

No matter where you put these 2 lines, they are invalid.

[flex567]

From the explenation:

No 2.
uses 'j +=5'. Now, this statement is preceded by 'int i=0,' and that means we are trying to declare variable j.

1) What does this sentence mean? Everyhing after

Code: Select all

int i=0

is decleration?

2) j = j + 5: This to me is not a declaration statement but initialization.(or just assignment)

[admin]

It is talking about the initialization section of the if statement, which contains: int i=0, j+=5;

Since this statement starts with the type specification i.e. int, it is a declaration statement. This declaration will apply to i as well as j. i is ok, but j has already been declared before the if statement, that is why complier will complain.

[flex567]

Aha I understand now, thanx

[unranked]

5 statement little confusing me. On the other statements there's declarations for variables. But on 5's, there's no declaration for j.

int j, var j = 0;

[admin]

I see that option 5 has int i = 0, j = 0; and not int j, var j = 0;

int i = 0, j = 0; is valid because the Java language allows it. It is called "compound declaration". i and j are considered to be of the same type i.e. int.

int i, var j = 0; is invalid because var declaration is not allowed in a compound declaration.

[unranked]

Yeah, sorry, sorry)
I didn't see that: int i = 0, j = 0;

thanks.