Question

I have the following code, expecting that once obj2 is released obj1 is still retained, will it work?

obj1 = [[Class1 alloc] init];
obj2 = [[obj1 retain] autorelease];

Answer 1

I have the following code, expecting that once obj2 is released obj1 is still retained, will it work?

obj1 and obj2 are both pointers to the same object. That object gets a retain count of 1 when you create it. The object’s retain count increases to 2 when you retain it again on the second line. The object (and any pointers to it) will therefore remain valid until it’s released twice. One of those releases will eventually come from the autorelease on the second line; another should be supplied by your code somewhere.