Array 与 ArrayList 的性能对比 [英] Array vs ArrayList in performance

问题描述

Object 类型的 Array 和 Object 类型的 ArrayList 哪个性能更好?

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

假设我们有一个 Animal 对象数组:Animal animal[] 和一个数组列表:ArrayList list

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

现在我在做 animal[10] 和 list.get(10)哪个应该更快，为什么?

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

推荐答案

很明显，array[10] 比 array.get(10) 快，因为后者在内部执行相同的调用，但增加了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.

然而，现代 JIT 会在一定程度上优化这一点，您很少需要担心这一点，除非您有一个非常关键的性能应用程序并且这已被测量为您的瓶颈.

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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