Question

I am learning Obj-C and don’t quite understand the purpose of the code on lines 3 to 5.

Can someone please explain them?

1.  myClassA.m
2.  #import myClassB
3.  @interface myClassA()
4.  -(void) methodA   
5.  @end
6.  @implementation myClassA
7.  mymethodA {
        NSLog{@"this is mymethodA");
    }

If you have some references about these, I am happy to go over it by myself.

Answer 1

Adding to Josh’s answer, Stanford’s Paul Hegarty, lecturing on iPad and iPhone programming stated it simply as (paraphrasing here):

Stuff defined (methods or properties) in the .h header file is public, stuff defined with @interface in the .m implementation file is private.

Hegarty’s lecture is very current and freely available on iTunes University.