No, actually, I meant it as I said it. Consider the following:
class A {
B b;
public String toString() {
return "I am an A";
}
protected void finalize() {
System.out.println(b); // Just do anything with b
// b is reachable here
}
}
class B {
A a;
public String toString() {
return "I am a B";
}
protected void finalize() {
System.out.println(a); // Just do anything with a
}
}
public class Test {
public static void main(String[] args) {
Test test = new Test();
test.setup();
// wait for GC
Object o = new Object();
synchronized (o) {
o.wait();
}
}
private void setup() {
A a = new A();
B b = new B();
a.b = b;
b.a = a;
}
}
Now, try it for yourself, and read the API docs for Object.finalize() and
see if you can't pull it out for yourself. I have included excerpts below
and emboldend the appropriate areas:
The general contract of finalize is that it is invoked if and when the
JavaTM virtual machine has determined that there is no longer any means by
which this object can be accessed by any thread that has not yet died,
<bold>except as a result of an action taken by the finalization of some
other object or class which is ready to be finalized.</bold>
After the finalize method has been invoked for an object, <bold>no further
action is taken until the Java virtual machine has again determined that
there is no longer any means by which this object can be accessed by any
thread that has not yet died, <bolder>including possible actions by other
objects or classes which are ready to be finalized, at which point the
object may be discarded. </bolder></bold>
INCLUDING POSSIBLE ACTIONS BY OTHER OBJECTS OR CLASSES WHICH ARE READY TO BE
FINALIZED
----- Original Message -----
From: "Niclas Hedhman" <[EMAIL PROTECTED]>
To: "Avalon framework users" <[EMAIL PROTECTED]>
Sent: Monday, December 15, 2003 9:57 AM
Subject: Re: When use ServiceManager.release(obj)?
> On Monday 15 December 2003 23:21, Jonathan Hawkes wrote:
>
> > Before an object is discarded, any object that references that object
will
> > have its finalize() method invoked.
>
> I think you typed the above statement wrongly...
> It should be the finalize() method of the "discarded" (actually transition
> from reachable/unfinalized state to finalizer-reachable/finalizable state)
> object that is called, not the referencing (no longer any reference, btw)
> objects.
>
> I assume it was an honest mistake (or you need to be sent back to Java
Torture
> School ;o) ).
>
> Cheers
> Niclas
>
>
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