in java if i define a String name = " "
its value will be automatiicaly assigned as null
yes or no?
#not defined string = null?
next sierra
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gentle musk
in java if i define a String name = " "
its value will be automatiicaly assigned...
No. (For fields):
String name = ""; // String with length 0
String name; // name is null
String name = null; // name is null
For local variables:
String name; // Variable is just not initialised. Using said variable without prior initilisation will return an exception at compile time.
String name = null; // Variable is initialised with the value null.
String name = "" // Same as fields
if int num;
num = null here?
vivid gazelle
No. (For fields):
```java
String name = ""; // String with length 0
String name;...
String name; // name is null
I would add, that if it's field - then null, if local variable inside a method - it's not initialized (so it's not null too)
royal garden
if int num;
num = null here?
no, int can't be null, int defaults to 0
all the primitives default to an equivalent of 0
boolean - false
char - '\0'
byte, short, int, long - 0
float, double - 0.0
next sierra
no, `int` can't be `null`, `int` defaults to `0`
ty
royal garden
> String name; // name is null
I would add, that if it's field - then null, if l...
it is null, it's just not allowed to be accessed
vivid gazelle
it is `null`, it's just not allowed to be accessed
it's not initialised, no matter what is it's inner state.
royal garden
but the
so it's not null too
isn't exactly correct
vivid gazelle
yeah, but still you can't do if (name == null)
royal garden
yeah because that's accessing it...
vivid gazelle
so there is no matter of what it's inner state
royal garden
it's... null though?
vivid gazelle
null or not
royal garden
that's just how it is
royal garden
so there is no matter of what it's inner state
god that sounds so much like the private inheritance discussion on the ts server the other day
vivid gazelle
can you give me practical example of usage not initialized (but inner null sate) of an object?
royal garden
no, because it's expressly not meant to be used
im not arguing that it's initialized to null or whatever
but saying it definitely isn't null is wrong
vivid gazelle
can you use it? can you do if (anObject == null)? no. so no point of saying it's null or not. it's not initialised.
royal garden
so no point of saying it's null or not.
so then why did you explicitly say "not null" if it doesn't matter?
vivid gazelle
because it has not initialised state
royal garden
which is distinct and separate from the value
vivid gazelle
neither null or not null
royal garden
no not how it works
vivid gazelle
did TC ask about JMM?
royal garden
the "not definitely initialized" thing is a compiler thing, it doesn't deal with values
null is a value
vivid gazelle
I guess he asked about how it bahaves in practice
royal garden
did TC ask about JMM?
i am so confused about what you're asking here
vivid gazelle
Im not asking
royal garden
who the hell is TC
vivid gazelle
topic creator
royal garden
i mean this isn't really a topic so that doesn't really work but ok
royal garden
the "not definitely initialized" thing is a compiler thing, it doesn't deal with...
anyways, this
it is uninitialized yes, but the underlying value would be null; it's just not accessible/readable
obtuse oar
Actually, local variables that haven't been initialized don't exist beside the compiler knowing you want a variable
They're not null nor anything, they just aren't
Once you initialize them, the compiler knows you want a variable and will organize to have it on the stack, where, on the stack and once pushed, it will have a value
Before that, it's nothing