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finalize method doubt

 
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Hi Friends,
Given is a question in Enthuware Test Series.Its c,d,e options are correct but I am confused about 'c' option as I have read that finalize method will only run once for an object.If in the finalize method the object to be GCed is referenced again,then its finalize will not run next time it is eligible for Garbage collection.Am I not clear somewhere.Please help.


Which of these statements are true?3 option


a.The compiler will fail to compile code that explicitly tries to call the finalize method.

b.The finalize method must be declared with protected accessibility.

c.If an object is being destroyed by the GC then its finalize() method is guaranteed to be called.

d.finalize method can be overloaded.

e.You can give any exception in throws clause of finalize() method.


Thanks in advance.
Himani
 
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Per my understanding C and D is correct but E is not because you can not give any exception in throws clause of finalize() method.
Paul can you clarify this please. I think this must be typo!!! or so called bug in your Software
 
Himani Gulati
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Hi Aaron,

thanks for your reply but as per my understanding to me 'e' should be correct because Because, the Object class's finalize() throws Throwable and all exceptions extend from Throwable.

but please tell me that will finalize method is guranteed to run every time for an object even if it has run once.isnt the condition that finalize method will only run once for an object is true.


Thanks in advance.
Himani
 
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Originally posted by Himani Gulati:
but as per my understanding to me 'e' should be correct because Because, the Object class's finalize() throws Throwable and all exceptions extend from Throwable.

Correct.

but please tell me that will finalize method is guranteed to run every time for an object even if it has run once.isnt the condition that finalize method will only run once for an object is true.

Have a look at the API documentation.
[ August 11, 2007: Message edited by: Manfred Klug ]
 
Aaron Raja
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finalize
protected void finalize()
throws ThrowableCalled by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.
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, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The finalize method may take any action, including making this object available again to other threads; the usual purpose of finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition.

The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the finalize method has been invoked for an object, 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, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The finalize method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.


Throws:
Throwable - the Exception raised by this method
 
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Hey Aaron

I think Manfred already gave the API link in his reply.
Why make it redundant, by copy-pasting the whole thing in your response ?
Keep it simple !
 
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