memory management in objective-c for retain

HI i have questions on Memory 开发者_如何学PythonManagement If I alloc object 1 time then i retain 2 time And then release 4 time & then retain 1 time for same object. what will be my final ans?

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Crrrrraaassshh!

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The object will be dealloced after the third release (when the retainCount hits zero) and the fourth release will be sent to a non-valid object, resulting in a crash.

If you want an object to exist for a little while after you've released it, you should look into the autorelease method.