oc-the code in the. h files and. m files in memory management, comments are important

. h file

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#import <Foundation/Foundation.h>

#import "Car.h"

@interface Person:nsobject

{

Car *_car;

NSString *_name;

}

-(void) SetName: (NSString *) name;

-(NSString *) name;

-(void) Setcar: (car *) car;

-(car *) car;

-(void) drive;

@end

. m file

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#import "Person.h"

@implementation person

-(void) SetName: (NSString *) name{

if (_name!=name) {

Release old value

[_name release];

Retain new value

_name=[name retain];

}

}

-(NSString *) name{

return _name;

}

-(void) Setcar: (Car *) car{

if (_car!=car) {//With this is afraid to pass in the same C1 two times, it will be a wild pointer error

C1=2->c1=1

[_car release];//when the first time C1 came in, because there was no car before, so _car=nil. [Nil release] execution does not error, but also invalid *//When C2 passed in, C1 before the main function has been release once, C1 has been 1, and the current _car is C1, so C2 in time, C1 (_car) release, Retaincount=0, automatic call dealloc destroy, [old value release]

C1 =2->c2=2

_car=[car retain];//When the first C1 came in, c1=1+1=2, when C2 passed in, C2 from 1 to 2, exit, return to main function

}

}

-(Car *) car{

return _car;

}

-(void) drive{

[_car Run];

}

-(NSString *) description{

//

return [NSString stringwithformat:@ "Age is%d", _age];

//}

-(void) dealloc{

Now it's C2, c2=0.

[_car RELEASE];//C2 has been passed in, ("At this time Car" =_car), at this time the _car again release, also destroyed to

[_name release];

NSLog (@ "Person object is destroyed!) "); Print 4:person object is destroyed!

[Super Dealloc];

}

@end

oc-the code in the. h files and. m files in memory management, comments are important