#import<Foundation/Foundation.h>

@interface Book :NSObject
{
int _price;
}
-(void)setPrice:(int)price
-(int)price;
@end

@implementation Book
-(void)setPrice:(int)price
{

_price = price;

}

-(int)price
{


return _price;
}



@end


//person类
@interface Person : NSObject
{
//组合
Book *_book;
}
-(void)setBook:(Book *)book;
-(Book *)book;
@end

@implementation
-(void)setBook:(Book *)book
{
_book = book

}

-(Book *)book
{

return book;
}
@end



int main()
{
//*******************
  Book *b =[[Book alloc] init];//创建对象

  Person *p1=[[Person alloc] init];














  [p1 release];
           //有alloc，马上写上[b release]在其下面

  [b release];//回收对象
//********************




return 0;
}

#import<Foundation/Foundation.h>

@interface Book :NSObject
{
int _price;
}
-(void)setPrice:(int)price
-(int)price;
@end

@implementation Book
-(void)setPrice:(int)price
{

_price = price;

}

-(int)price
{


return _price;
}



@end


//person类
@interface Person : NSObject
{
//组合
Book *_book;
}
-(void)setBook:(Book *)book;
-(Book *)book;
@end

@implementation
-(void)setBook:(Book *)book
{
_book = book

}

-(Book *)book
{

return book;
}
@end



int main()
{
//*******************
  Book *b =[[Book alloc] init];//创建对象

  Person *p1=[[Person alloc] init];














  [p1 release];
           //有alloc，马上写上[b release]在其下面

  [b release];//回收对象
//********************




return 0;
}