OC3_dealloc

//
//  Dog.h
//  OC3_dealloc
//
//  Created by zhangxueming on 15/6/18.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//
 
#import <Foundation/Foundation.h>
 
@interface Dog : NSObject
 
@end
 
//
//  Dog.m
//  OC3_dealloc
//
//  Created by zhangxueming on 15/6/18.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//
 
#import "Dog.h"
 
@implementation Dog
 
- (void)dealloc
{
    NSLog(@"dog release!!!");
    [super dealloc];
}
 
@end

//
//  main.m
//  OC3_dealloc
//
//  Created by zhangxueming on 15/6/18.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//
 
#import <Foundation/Foundation.h>
#import "Dog.h"
 
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Dog *xiaoHei = [[Dog alloc] init];
        Dog *xiaoBai = [xiaoHei retain];
        NSLog(@"retainCount = %li", xiaoBai.retainCount);
        Dog *xiaoHui = [xiaoHei retain];
        NSLog(@"retainCount = %li", xiaoHui.retainCount);
        [xiaoHei release];
        NSLog(@"retainCount = %li", xiaoBai.retainCount);
        [xiaoBai release];
        NSLog(@"retainCount = %li", xiaoHui.retainCount);
 
        //最后一次release 的时候,retainCount理论值为的0, 自动调用dealloc方法释放对象
        [xiaoHui release];
 
    }
    return ;
}