比较int和Integer的性能 [英] Comparing Performance of int and Integer

问题描述

哪一个最适合编程 - int 或整数？特别是每个人都在做同样的任务？

Which one is best in programming - int or Integer? Especially whenever both are doing the same task?

我正在用Java编写一个应用程序。在原始数据类型的大多数地方，我使用 int ;对于对象，我使用 Integer 。所以我很困惑 - 哪一个是最好的地方，我们必须使用对象。

I am writing an application in Java. In most of the places of primitive data types, I use int; and for objects, I use Integer. So I am confused- which one is the best in places, where we have to use objects.

根据性能，哪一个最适合Java应用程序？

According to performance, which one is best for a Java application?

推荐答案

尽可能使用 int ，并使用 Integer 需要时。由于 int 是一个原语，它会更快。现代JVM知道如何使用自动装箱优化 Integer ，但如果您正在编写性能关键代码， int 是要走的路。

Use int when possible, and use Integer when needed. Since int is a primitive, it will be faster. Modern JVMs know how to optimize Integers using auto-boxing, but if you're writing performance critical code, int is the way to go.

看看这个和这篇文章。虽然你不应该将它们视为绝对真理，但它们确实表明对象将比原始对象慢。

Take a look at this and this article. Although you shouldn't treat them as absolute truths, they do show that objects will be slower than their primitive counterparts.

所以，使用 int 尽可能（我会重复自己：如果你正在编写性能关键代码）。如果某个方法需要Integer，请改用它。

So, use int whenever possible (I will repeat myself: if you're writing performance critical code). If a method requires an Integer, use that instead.

如果您不关心性能并希望以面向对象的方式执行所有操作，请使用整数。

If you don't care about performance and want to do everything in an object oriented fashion, use Integer.

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