SMutableArray* ary = [[NSMutableArray array] retain];  

NSString *str = [NSString stringWithFormat:@"test"];  

[str retain];   

[ary addObject:str];

NSLog(@"%d", [str retainCount]);  

[str retain];  

[str release];

[str release];

NSLog(@"%d", [str retainCount]);  

[ary removeAllObjects];

NSLog(@"%d", [str retainCount]);

SMutableArray* ary = [[NSMutableArray array] retain];  

NSString *str = [NSString stringWithFormat:@"test"];  

[str retain];   

[ary addObject:str];

NSLog(@"%d", [str retainCount]);  

[str retain];  

[str release];

[str release];

NSLog(@"%d", [str retainCount]);  

[ary removeAllObjects];

NSLog(@"%d", [str retainCount]);