iphone: What is the difference between setObject:forKey: and setValue:forKey: in Adding Entries to a Mutable Dictionary [duplicate]

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Possible Duplicate:

Where's the difference between setObject:forKey: and setValue:forKey: in NSMutableDictionary?

Hi,

setObject:forKey:

Adds a given key-value pair to the dictionary.

- (void)setObject:(id)开发者_开发问答anObject forKey:(id)aKey

Again

setValue:forKey:

Adds a given key-value pair to the dictionary.

- (void)setValue:(id)value forKey:(NSString *)key

Then what is the difference in between them? Is the difference only in receiving parameters? can setObject:forKey: be used instead of setValue:forKey: ?

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From the doc:

setValue:forKey:

Discussion
This method adds value and key to the dictionary using setObject:forKey:, unless value is nil in which case the method instead attempts to remove key using removeObjectForKey:.

setObject:forKey:

Important
Raises an NSInvalidArgumentException if aKey or anObject is nil. If you need to represent a nil value in the dictionary, use NSNull.

If aKey already exists in the dictionary, the dictionary’s previous value object for that key is sent a release message and anObject takes its place.