问题描述

我刚刚在一份旧试卷中发现了这个试题，并且正在为即将到来的考试做准备.我想不通:

I just found this exam question in an old exam paper and am readying myself for an upcoming exam. I cannot figure it out :

下面描述了一个人为的部分类，它实现了 Iterable 接口.此类的唯一目的是提供一种方法来迭代属性 things.

The following depicts a contrived partial class which implements the Iterable interface. The only purpose of this class is to provide a method to iterate over the attribute things.

我们需要在课堂上填写两件事来完成它.这里是类

There are two things we need to fill in in the class to finish it. Here is the class

private class PartialIterableClass /*FILL IN */ {
   private String[] things;
   public PartialIterableClass( String[] things ){
      this.things = things;
   }
   /*FILL IN 2*/
}

我猜它应该类似于:

private class PartialIterableClass implements Iterable<PrivateIterableClass> {
   private String[] things;
   public PartialIterableClass( String[] things ){
      this.things = things;
   }
   public Iterator<PartialIterableClass> iterator( ){
   return new Iterator<PartialIterableClass>( ) {

   }
   }
}

不过，我不确定如何充实这个问题的答案，有人可以帮忙吗?

I'm not really sure how to flesh out an answer to this question though, can anybody help?

推荐答案

你的 Iterator 必须实现 Iterator 接口中的所有方法，才能封装迭代逻辑.

Your Iterator must implement all the methods from the Iterator interface in order to encapsulate the iteration logic.

在您的情况下，它必须保存数组中的当前迭代索引.您可以查看 ArrayIterator 来自 commons-collections

In your case, it will have to hold the current iteration index in the array. You can look at ArrayIterator from commons-collections

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