Object-c学习之路四（oc内存管理autorelease）

再以Student和Book为例作为展示：

1.主函数：

//  main.m
//  MemoryManagement2
//
//  Created by WildCat on 13-7-24.
//  Copyright (c) 2013年 wildcat. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Book.h"
#import "Student.h"
int main(int argc, const char * argv[])
{

    @autoreleasepool {
        Student *stu=[[[Student alloc] init] autorelease];
        Book *book=[[[Book alloc] init] autorelease];
        stu.book=book;

        Student *stu2=[Student student];
        Student *stu3=[Student studentWithAge:20];
    }
    return 0;
}

2.Student函数：

//  Student.h
//  MemoryManagement2
//
//  Created by WildCat on 13-7-24.
//  Copyright (c) 2013年 wildcat. All rights reserved.
//

#import <Foundation/Foundation.h>
@class Book;
@interface Student : NSObject
#pragma mark - 属性定义
#pragma mark @property关键字的 用法
//nonatomic表示不支持多线程 atomic表示支持多线程
@property (nonatomic,retain) Book *book;
@property (nonatomic,setter = isReach:) BOOL rich;
@property (nonatomic,assign) int age;
#pragma mark - 静态方法快速创建
+(id)student;
+(id)studentWithAge:(int)age;

@end

#import "Student.h"
#import "Book.h"
@implementation Student
#pragma mark - 销毁对象
-(void)dealloc{

    //销毁Book
    NSLog(@"Student %@ ,被销毁。",self);
    self.book=nil;
    [super dealloc];
}
#pragma mark - 静态方法快速创建对象
+(id)student{
    return [[[Student alloc] init] autorelease];
}
+(id)studentWithAge:(int)age{
    Student *stu=[self student];
    stu.age=age;
    return stu;
}

@end

3.Book函数略