如何在Clojure中转换Java类? [英] How can I cast a Java class in Clojure?

问题描述

我想将clojure Java对象(分配给let *)转换为另一种Java类类型.这可能吗?如果可以，我该怎么做?

I would like to cast a clojure Java object (assigned with let*) to another Java class type. Is this possible and if so then how can I do this?

更新:自从我发布了这个问题以来，我已经意识到我不需要强制转换Clojure，因为它没有接口的概念，更像是Ruby Duck类型.我只需要在知道某个对象肯定是某种类型的情况下进行强制转换，在这种情况下，我会收到ClassCastException

Update: Since I posted this question I have realised that I do not need to cast in Clojure as it has no concept of an interface, and is more like Ruby duck typing. I only need to cast if I need to know that an object is definitely of a certain type, in which case I get a ClassCastException

推荐答案

在 clojure.core 中有一个 cast 函数可以做到这一点:

There is a cast function to do that in clojure.core:

user> (doc cast)
-------------------------
clojure.core/cast
([c x])
  Throws a ClassCastException if x is not a c, else returns x.

顺便说一句，您不应该直接使用 let * －这只是 let 后面的实现细节(应该在用户代码中使用).

By the way, you shouldn't use let* directly -- it's just an implementation detail behind let (which is what should be used in user code).

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