迭代器和可迭代之间有什么区别以及如何使用它们? [英] What is the difference between iterator and iterable and how to use them?

问题描述

我是 Java 新手，我对迭代器和可迭代感到非常困惑.谁能给我解释一下并举一些例子?

I am new in Java and I'm really confused with iterator and iterable. Can anyone explain to me and give some examples?

推荐答案

Iterable 是一系列可以迭代的元素的简单表示.它没有任何迭代状态，例如当前元素".相反，它有一种方法可以生成 Iterator.

An Iterable is a simple representation of a series of elements that can be iterated over. It does not have any iteration state such as a "current element". Instead, it has one method that produces an Iterator.

Iterator 是具有迭代状态的对象.它允许您使用 hasNext() 检查它是否有更多元素，并使用 next() 移动到下一个元素(如果有).

An Iterator is the object with iteration state. It lets you check if it has more elements using hasNext() and move to the next element (if any) using next().

通常，Iterable 应该能够产生任意数量的有效 Iterator.

Typically, an Iterable should be able to produce any number of valid Iterators.

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