阵VS性能的ArrayList [英] Array vs ArrayList in performance

问题描述

哪一个类型的对象和Object类型的ArrayList中的阵列之间的性能比较好？

Which one is better in performance between Array of type Object and ArrayList of type Object?

假设我们有动物对象的数组：兽兽[] 和ArrayList的： ArrayList的名单＆LT;动物＆GT;

Assume we have a Array of Animal objects : Animal animal[] and a arraylist : ArrayList list<Animal>

现在我做的动物[10] 和 list.get（10）
哪一个应该会更快，为什么？

Now I am doing animal[10] and list.get(10) which one should be faster and why?

推荐答案

有pretty明显，数组[10]比array.get（10）速度更快，因为后来在内部做了同样的电话，但增加了开销的函数调用加上额外的检查。

It is pretty obvious that array[10] is faster than array.get(10), as the later internally does the same call, but adds the overhead for the function call plus additional checks.

现代JIT们却会优化这在一定程度上，你很少担心这个，除非你有一个非常关键的性能应用，这已测得为你的瓶颈。

Modern JITs however will optimize this to a degree, that you rarely have to worry about this, unless you have a very performance critical application and this has been measured to be your bottleneck.

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