Enthuware

Just an FYI

In the answer section the explanation contains a couple of items that don't form part of the question:

int[] iA = new int[10]; will contain 10 integers with a value of 0.
Object[] oA = new Object[10]; will contain 10 object references pointing to null.

This is to present the complete picture. While reading about an array of booleans, a curious mind would like to know what about an array of ints or an array of Objects

Cool, no probs, I thought it might have been because the question was modified at some point and the explanation was forgotten about, though you are correct It is useful info. (You can never have too much of that!)

I thought that 'str' (being a String) is immutable? ie even if bA[0] was true, str would still be "111"...

Could you confirm just in case I get a question similar to this on the exam?

Cheers

AnotherGuest wrote:I thought that 'str' (being a String) is immutable? ie even if bA[0] was true, str would still be "111"...

Could you confirm just in case I get a question similar to this on the exam?

Cheers

No, str is not immumable. The String object being pointed to by str is immutable. You can make str point to different String objects, you can't change the String objects themselves. So if bA[0] was true, str would then be changed to point to another String object. The String object it pointed to originally would still be the same. In other words, "111" will not become "222", but str will point to another String containing "222".

If you want to prevent a variable from changing (i.e. prevent str from pointing to any other String object), you can make it final.

HTH,
Paul.

Ugh, I missed this one because I thought about the "local variables aren't initialized" part... but this was helpful.

So, local variables of type array are initialized.
Local primitive variables aren't initialized.

AndaRO wrote:So, local variables of type array are initialized.
Local primitive variables aren't initialized.

Where did you read this? How did you reach this conclusion that local variables of type array are initialized? This is incorrect. Local variables of any kind are not initialized by default.

Paul.