ArrayList的装饰器 [英] Decorator for an ArrayList

问题描述

如何在不使用内置装饰器的情况下为ArrayList实现装饰器使其不可变

How to Implement decorator for an ArrayList to make it immutable without using the built in decorator

推荐答案

你真的明白你在问什么吗？我怀疑，因为如果你这样做，你就不会问这样的问题，因为这太简单了。您可以创建一个包装类，该类使用 ArrayList 的某个实例进行初始化，并仅公开对元素的只读访问权限。我建议，除了上面描述的构造函数之外，包装器只暴露了两个属性：get element Count 和index by index。然而，除此之外，你可以实现数百万的东西：克隆，搜索等等......



请参阅：http://en.wikipedia.org/wiki/Decorator_pattern [ ^ ]。

-SA

Do you really understand what you are asking about? I doubt, because if you did, you would not ask such question, because this is way too simple. You can create a wrapper class which is initialized with some instance of the ArrayList and exposes only the read-only access to the elements. I would suggest that, except the constructor I described above, the wrapper exposed only two properties: get element Count and the object by index. However, on top of it, you could implement million of things: cloning, search, and a lot more…

Please see also: http://en.wikipedia.org/wiki/Decorator_pattern[^].

—SA

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