Difference between NSArray and NSMutableArray

Question

b / w NSArray和NSMutableArray什么区别？

Answer 1

NSMutableArray (and all other classes with Mutable in the name) can be modified. So, if you create a plain NSArray , you cannot change its contents later (without recreating it). But if you create an NSMutableArray , you can change it — you'll notice it has methods like -addObject: and -insertObject:atIndex: .

See the documentation for details.

Answer 2

“可变”类型是可以在初始化后更改的类，如NSMutableString vs NSString 。

Answer 3

NSArray : in NSArray we can not change index.... Means fix array.

NSMutableArray : in NSMutableArray we can change index and also add the value in array at run-time..