写一个setter方法用于完成@property (nonatomic,retain)NSString *name,写一个setter方法用于完成@property(nonatomic，copy)NSString *name

-- (void) setName:(NSString*) str
{
[str retain];
[name release];
name = str;
}
-- (void)setName:(NSString *)str
{
id t = [str copy];
[name release];
name = t;
}

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