可变和不可变之间有什么区别 [英] what is difference between mutable and immutable

问题描述

什么是可变和不可变的区别

what is difference mutable and immutable

喜欢

NSString和NSMutableString。

NSString and NSMutableString.

NSArray和NSMutableArray。

NSArray and NSMutableArray.

NSDictionary和NSMutableDictionary。

NSDictionary and NSMutableDictionary.

有什么区别可变对象和另一个对象之间[我猜不可变]

What is difference between mutable object and the other object[which i guess immutable]

@thanks提前。

@thanks in advance.

推荐答案

可以改变或改变可变对象。不可变对象不能。例如，虽然您可以在NSMutableArray中添加或删除对象，但您无法使用NSArray。

A mutable object can be mutated or changed. An immutable object cannot. For example, while you can add or remove objects from an NSMutableArray, you cannot do either with an NSArray.

可变对象可以更改，添加或删除元素，使用不可变对象无法实现。在 [[object alloc] initWith ...] 初始值设定项中，不可变对象会被你提供的任何输入所困。

Mutable objects can have elements changed, added to, or removed, which cannot be achieved with immutable objects. Immutable objects are stuck with whatever input you gave them in their [[object alloc] initWith...] initializer.

你的可变对象的优点是显而易见的，但它们只应在必要时使用（这比你想象的要少得多），因为它们占用的内存比不可变对象多。

The advantages of your mutable objects is obvious, but they should only be used when necessary (which is a lot less often than you think) as they take up more memory than immutable objects.

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