将集合转换为数组的最简单方法? [英] The easiest way to transform collection to array?

问题描述

假设我们有一个 Collection.将其转换为 Foo[] 的最佳(在当前上下文中是 LoC 中最短的)方法是什么?允许使用任何知名库.

Suppose we have a Collection<Foo>. What is the best (shortest in LoC in current context) way to transform it to Foo[]? Any well-known libraries are allowed.

UPD:(本节还有一个案例；如果您认为值得为它创建另一个线程，请留下评论):如何将 Collection 转换为 Bar[] 其中 Bar 具有带有 1 个 Foo 类型参数的构造函数，即 public Bar(Foo foo){ ... } ?

UPD: (one more case in this section; leave comments if you think it's worth to create another thread for it): What about transforming Collection<Foo> to Bar[] where Bar has constructor with 1 parameter of type Foo i.e. public Bar(Foo foo){ ... } ?

推荐答案

其中 x 是集合:

Foo[] foos = x.toArray(new Foo[x.size()]);

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