如何检查Groovy的对象是一个列表或集合或数组？ [英] How to check in Groovy that object is a list or collection or array?

问题描述

问题和标题一样简单。如何检查Groovy的对象是一个列表或集合或数组？但是找不到一个简单的方法来检查它。任何想法？

The question is as simple as the title. How to check in Groovy that object is a list or collection or array? But can't find a simple way of checking it. Any ideas?

推荐答案

我不知道你是否需要区分Collection，List和Array，如果对象是任何这些类型。如果是后者，你可以使用：

I don't know if you need to distinguish between Collection, List and Array, or just want to know if an object is any of these types. If the latter, you could use this:

boolean isCollectionOrArray(object) {    
    [Collection, Object[]].any { it.isAssignableFrom(object.getClass()) }
}

// some tests
assert isCollectionOrArray([])
assert isCollectionOrArray([] as Set)
assert isCollectionOrArray([].toArray())
assert !isCollectionOrArray("str")

在Groovy控制台中运行上面的代码，确认它的行为符合广告

Run the code above in the Groovy console to confirm it behaves as advertised

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