java 如何在java中重置迭代器？
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How to reset iterator in java?
提问by Hassan Farooqi
How do I reset reset an iterator to its first element?
如何重置将迭代器重置为其第一个元素？
Below, I have an Sigmaiterator. How do I reset the iterator to its first element when the whileloop completes?
下面，我有一个Sigma迭代器。while循环完成后如何将迭代器重置为其第一个元素？
Iterator it = Sigma.iterator();
while(it.hasNext()){
letter= (String) it.next();
System.out.println(letter);
}
回答by Boann
You do not need to reset it, and cannot do so. Collections are not like a cassette tape that you need to rewind. You can simply discard the old iterator.
您不需要重置它，也不能这样做。收藏品不像需要倒带的盒式磁带。您可以简单地丢弃旧的迭代器。
Every time you call Sigma.iterator()again it will return a fresh iterator which starts iterating at the beginning of the collection.
每次您Sigma.iterator()再次调用时，它都会返回一个新的迭代器，该迭代器在集合的开头开始迭代。
回答by Raymond Kelly
I haven't done much work with Iterators but I'm guessing you could set the iterator to its original state.
我没有对迭代器做过多少工作，但我猜你可以将迭代器设置为其原始状态。
Iterator it = Sigma.iterator();
while(it.hasNext()){
letter= (String) it.next();
System.out.println(letter);
}
it = Sigma.iterator();
