NSSArray

------------------------NSSArray--------------------------------

NSSArray *arr = [[NSSArray alloc] initWithObjects:@"one",nil];

//数组中装有元素的地址 可以是任意对象

NSLog(@"%@", arr);//%@->rewite desciption method

NSEnumerator *enu = [arr objectEnumerator];

id obj;

while(obj = [enu nextObject]){ ... }

for(id obj in arr ){ ... }

-----------------------NSMutableArray--------------------------

NSMutableArray *arr = [[NSMutableArray alloc] init];

[arr addObject:@"one"];

[arr removeObject:@"one"];

[arr removeObjectAtIndex:0];

[arr exchangeObjectAtIndex:0 withObjectAtIndex:1];

NSEnumerator * enu = [arr objectEnumerator];

NSString *str;

while(str = [enu nextObjcet ]){ ... }

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NSString *str = @"I am a good man";//逆序输出字符串

NSArray *arr = [str componentsSeparatedByString:@" "];//separated string

NSMutableArray *arr1 = [[NSMutableArray alloc]init ];

NSEnumerator *enu = [arr reverseObjectEnumerator];

NSString * obj;

while(obj = [enu nextObject]){

[arr1 addObject:obj]

}

NSString *newStr = [arr1 conponentsJoinByString:@" "];

NSLog(@"%@",newStr);

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