OC对象的动态和静态构造区别

Student.h:

#import <Foundation/Foundation.h>

@interface Student : NSObject

@property(nonatomic,retain) NSString * name;

@property(nonatomic,assign) int age;

@end

Student.m:

#import "Student.h"

@implementation Student

//动态方法，在main函数中类alloc了之后调用，但是要手动管理内存，要手动释放

-(id) initWithAge:(int)age{

    if (self == [super init]) {

        _age = age;

    }

    return self;

}

 

//静态构造方法,在main函数中不需要你手动管理内存释放

+(id)studentWithAge:(int)age{

    Student *stu = [[[Student alloc] init] autorelease];

    stu.age = age;

    return stu;

}

 

-(NSString *)description{

    return [NSString stringWithFormat:@"name:%@ age:%i创建了",_name,_age];

}

 

-(void)dealloc{

    NSLog(@"name:%@ age:%i被释放了",_name,_age);

    [_name release];

    [super dealloc];

}

@end

　　

main

 1 #import <Foundation/Foundation.h>
 2 
 3 #import "Student.h"
 4 
 5 int main(int argc, const char * argv[])
 6 
 7 {
 8 
 9     @autoreleasepool {
10 
11         //动态方法需要手动释放内存
12 
13         Student *stu1= [[Student alloc] initWithAge:10];
14 
15         stu1.name = @"dingxiaowei";
16 
17         NSLog(@"%@",stu1);
18 
19         [stu1 release];
20 
21         //静态构造方法不需要你管理内存
22 
23         Student *stu2 =[Student studentWithAge:20];
24 
25         stu2.name = @"wangning";
26 
27         NSLog(@"%@",stu2);
28 
29     }
30 
31     return 0;
32 
33 }

　　

结果：