Student.h:

#import <Foundation/Foundation.h>   @interface Student : NSObject  @property int age;  //默認會生成一個_age屬性  @end

#import "Student.h"  @implementation Student //@synthesize age=_age;//xcode4.5中可以不使用synthesise方法，直接在頭文件中使用property方法即可 //如果只在m文件中定義而沒有在h文件中申明的方法屬于privte方法，如果不寫類型一般默認是protected方法 -(void)dealloc{  //構造父類的回收方法     NSLog(@"%@被銷毀了",self);     NSLog(@"_age %i",_age);     [super dealloc];//一定要調用super的dealloc方法,最好放在最后面調用 } @end

#import <Foundation/Foundation.h> #import "Student.h"  int main(int argc, const char * argv[]) {      @autoreleasepool {         Student *stu=[[[Student alloc] init] autorelease];  //alloc方法計數器為1         [stu retain];//調用一次retain方法計數器加1         NSLog(@"retaincount is %zi",[stu retainCount]);         [stu release];//調用一次release方法計數器減1         NSLog(@"retaincount is %zi",[stu retainCount]);         stu.age=10;         [stu retain];//add 1         //這兒retainCount返回的是Unsigned long 無符號長整形 ％z代表無符號         NSLog(@"retaincount is %zi",[stu retainCount]);         NSLog(@"Student age is %i",[stu age]);         [stu release];  //計數器為0就調用dealloc方法     }     return 0; } 

2013-08-02 14:57:25.342?內存管理1retain和release[788:303] retaincount is 2

2013-08-02 14:57:25.344?內存管理1retain和release[788:303] retaincount is 1

2013-08-02 14:57:25.344?內存管理1retain和release[788:303] retaincount is 2

2013-08-02 14:57:25.344?內存管理1retain和release[788:303] Student age is 10

2013-08-02 14:57:25.345?內存管理1retain和release[788:303] <Student: 0x100109a90>被銷毀了

2013-08-02 14:57:25.345?內存管理1retain和release[788:303] _age 10