#import <Foundation/Foundation.h>

@interface Person : NSObject

{

      int _money;

      int money;

}

@property int money;

- (void)test;

@end

@implementation Person

- (void)setMoney: (int)money

{

    self->money = money;

}

- (void)test

{

NSLog(@"money=%d, _money=%d, self.money=%d", money, _money, self.money);

}

@end

int main()

{

    Person *p = [Person new];

      p.money = 2000;

      [p test];

   return 0;

}

请问下这道题为什么输出的是    money=2000, _money=0, self.money=0  整不大明白......

#import <Foundation/Foundation.h>
@interface Person : NSObject
{
      int _money;
      int money;
}

@property int money;

- (void)test;
@end

@implementation Person
- (void)setMoney: (int)money
{
    self->money = money;//重写了setter方法,等同于money = money;

}
- (void)test

{

NSLog(@"money=%d, _money=%d, self.money=%d", money, _money, self.money);//self.money等同于_money



}
@end
int main()
{
    Person *p = [Person new];
      p.money = 2000;//调用setter方法，等同于[p setAge:2000];
      [p test];
   return 0;

}
//此段代码调用重写的setter方法为money赋值，所以money=2000,没有为_money赋值，所以_money=0;