下面哪个set函数是正确的:( )
-(void)setAge:(int)newAge{
self.age=newAge;
}
-(void)setAge:(Age*)newAge{
age=newAge;
}
-(void)setAge:(Age*)newAge{
[age release];
[newAge retain];
self.age=newAge;
}
-(void)setAge:(Age*)newAge{
[newAge retain];
[age release];
age=newAge;
}