总是使用Final吗? [英] Always Use Final?

问题描述

我已经读到做一些最终的事情，然后在循环中使用它会带来更好的性能，但是对所有事情都有利吗?我在很多地方都没有循环，但是我将final添加到局部变量中.它会使速度变慢还是仍然很好?

I have read that making something final and then using it in a loop will bring better performance, but is it good for everything? I have lots of places where there isnt a loop but I add final to the local variables. Does it make it slower or is it still good?

在某些地方，我有一个全局变量final(例如android paint)，这是否意味着在循环使用它时不必将其设置为局部final?

Also there are some places where I have a global variable final (e.g. android paint), does it mean I don't have to make it a local final when using it in loops?

推荐答案

您应该考虑的第一件事是:我编写此代码最简单，最清晰的方法是什么.通常，这种方法效果不错.

The first thing you should consider is; What is the simplest and clearest way I can write this code. Often this performs well.

final局部变量不太可能对性能产生很大影响.当您使用长方法时，它们可以帮助澄清，但我建议分手方法是一种更好的方法.

final local variables is unlikely to affect performance much. They can help clarity when you have long methods, but I would suggest breaking up method is a better approach.

final字段可能会在很小程度上影响性能，但使其成为final的更好理由是要明确表明此字段永不更改(这也有助于JIT)

final fields can affect performance to small degree, but a better reason to make it final is to make it clear that this field never changes (which also helps the JIT)

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