Can I add the same object to two different arrays?

Is this valid:

 NSObject anObject = [[NSObject alloc] init];
 [array1 addObject:anObject];
 [array2 addObject:anObject];

My money is on yes开发者_高级运维, since I'm only adding references to the same object, or am I wrong here?

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Yes :) Dont forget to make it a mutable array