什么是invokedynamic以及如何使用它？ [英] What's invokedynamic and how do I use it?

问题描述

我一直听说有关添加到JVM的所有新酷功能，其中一个很酷的功能是invokedynamic。我想知道它是什么以及它如何使Java中的反射编程更容易或更好？

I keep hearing about all the new cool features that are being added to the JVM and one of those cool features is invokedynamic. I would like to know what it is and how does it make reflective programming in Java easier or better?

推荐答案

这是一个新的允许编译器生成代码的JVM指令，该代码调用具有比以前更宽松的规范的方法 - 如果你知道什么是 duck typing 是的，invokedynamic基本上允许鸭子打字。作为Java程序员可以用它做的事情并不多;但是，如果您是工具创建者，则可以使用它来构建更灵活，更高效的基于JVM的语言。 此处是一篇非常精彩的博客文章，提供了大量细节。

It is a new JVM instruction which allows a compiler to generate code which calls methods with a looser specification than was previously possible -- if you know what "duck typing" is, invokedynamic basically allows for duck typing. There's not too much you as a Java programmer can do with it; if you're a tool creator, though, you can use it to build more flexible, more efficient JVM-based languages. Here is a really sweet blog post that gives a lot of detail.

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