NSString 字符串管理内存

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NSString * str=[[NSString alloc]init];
NSString * str1 =[[NSString alloc]initWithFormat:@"haha"];
str=str1;
NSLog(@"str1=%d",[str1 retainCount]);
[str1 release];
NSLog(@"str1=%d",[str1 retainCount]);

2013-08-06 10:13:01.907 releaseCOunt[2653:c07] str1=1
2013-08-06 10:13:01.908 releaseCOunt[2653:c07] str1=1