从 Java Set 中获取 *any* 值的好方法?
给定一个简单的 Set<T>
,从 Set
获取 any 值的好方法是什么(快速,几行代码)代码>?
Given a simple Set<T>
, what is a good way (fast, few lines of code) to get any value from the Set
?
有了List
,很简单:
List<T> things = ...;
return things.get(0);
但是,对于 Set
,没有 .get(...)
方法,因为 Set
没有顺序.
But, with a Set
, there is no .get(...)
method because Set
s are not ordered.
推荐答案
一个 Set
是一个 Iterable
,所以迭代到第一个元素是可行的:
A Set<T>
is an Iterable<T>
, so iterating to the first element works:
Set<T> things = ...;
return things.iterator().next();
Guava 有 一种方法 来做到这一点,虽然上面的代码片段 可能更好.
Guava has a method to do this, though the above snippet is likely better.
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