OBJECTIVE-C----NEW

When you create an object using new, the system actually performs two steps in the background:
The first step: Allocate memory for the object, that is, the object obtains a memory block to hold the instance variable;
Second part: The Init method is automatically called to bring the object into a usable state.

Note: The internal implementation of Alloc is new.

 
@implementation Car
- (id) init
{ if (self = [super init]) {
     engine = [Engine new];
     tires[0] = [Tire new];
     tires[1] = [Tire new];
     tires[2] = [Tire new];
     tires[3] = [Tire new];
     } return (self);
} // init

OBJECTIVE-C----NEW