问题描述
如果我有一个包含 [alice, bob, abigail, charlie] 的列表，并且我想编写一个迭代器，以便它遍历以 'a' 开头的元素，我可以编写自己的吗?我怎样才能做到这一点 ?
If I have a list containing [alice, bob, abigail, charlie] and I want to write an iterator such that it iterates over elements that begin with 'a', can I write my own ? How can I do that ?
推荐答案
当然.迭代器只是 java 的一个实现.util.Iterator 接口.如果您正在使用来自 java.util 的现有可迭代对象(例如，LinkedList)，则需要对其进行子类化并覆盖其 iterator 函数，以便您返回自己的，或提供一种将标准迭代器包装在您的特殊 Iterator 实例中的方法(其优点是使用更广泛)，等等.
Sure. An iterator is just an implementation of the java.util.Iterator interface. If you're using an existing iterable object (say, a LinkedList) from java.util, you'll need to either subclass it and override its iterator function so that you return your own, or provide a means of wrapping a standard iterator in your special Iterator instance (which has the advantage of being more broadly used), etc.
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