代码清单18-2 数组操作

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NSMutableArray *dataArray = [NSMutableArray arrayWithObjects:            [NSMutableString stringWithString: @"one"],            [NSMutableString stringWithString: @"two"],            [NSMutableString stringWithString: @"three"],            Nil        ];        NSMutableArray *dataArray2;        NSMutableString *mStr;                NSLog(@"dataArray: ");        for(NSString *elem in dataArray)            NSLog(@"   %@", elem);                //复制一份，然后删除副本的第一个元素        dataArray2 = [dataArray mutableCopy];        mStr = [dataArray objectAtIndex: 0];        [mStr appendString: @"ONE"];                NSLog(@"dataArray:   ");        for(NSString *elem in dataArray)            NSLog(@"   %@", elem);                NSLog(@"dataArray2:   ");        for(NSString *elem in dataArray2)            NSLog(@"   %@", elem);

2013-11-14 20:43:20.248 prog2[3503:303] dataArray:

2013-11-14 20:43:20.249 prog2[3503:303] one

2013-11-14 20:43:20.249 prog2[3503:303] two

2013-11-14 20:43:20.250 prog2[3503:303] three

2013-11-14 20:43:20.250 prog2[3503:303] dataArray:

2013-11-14 20:43:20.250 prog2[3503:303] oneONE

2013-11-14 20:43:20.250 prog2[3503:303] two

2013-11-14 20:43:20.250 prog2[3503:303] three

2013-11-14 20:43:20.251 prog2[3503:303] dataArray2:

2013-11-14 20:43:20.251 prog2[3503:303] oneONE

2013-11-14 20:43:20.251 prog2[3503:303] two

2013-11-14 20:43:20.251 prog2[3503:303] three