Employee.h
@interface Employee:NSObject
{
int _employeeNumber;
NSString *_name;
Employee*_supervisitor;
int _salary;
}
@property int employeeNumber;
@property(nonatomic,retain) NSString * name;
@property(nonatomic,retain)Employee *supervisitor;
@property int salary;
......
@end
Employee.m
@implementation Employee
@synthesize employeeNumber;
@synthesize name;
//@synthesize supervistor;//在这不要实现setter和getter下面手动实现
@synthesize salary;
-(void)setSupervistor:(Employee *)newSupervisitor
{
[newSupervistor retain];
[_supervistor release];
_supervistor=newSupervisitor;
}
-(Employee*)supervisitor
{
return _supervisitor;
}
//上面代码解释：上面代码的顺序很重要。向存储在supervisitor中的当前对象发送一条release消息，会对应当存储它的时候所接受的一条retain消息
