Some beginner Objective-C/iPhone questions

Question

I\'m just starting out (reading up a lot for the past couple of days). Here\'s some questions that I have stacked up, hopefully someone can answer them.

1.

Answer 1

1: This check is to ensure that the super constructor returned a new object.

2: Static methods don't refer to an instance

3:

str = @"Hi there!"

This assigns the address of the constant string "Hi there!" to the pointer str

str = [[NSString alloc] initWithString:@"Hi there!"];

This allocates a string and copies "Hi There!" to it. This means that a) str is modifiable and b) needs to be deallocated when you are done with it.