java - 有状态迭代器 Java

Question

什么是有状态迭代器？

这个问题与 Hadoop 中定义的用于执行连接的迭代器有关。作为引用documentation状态:

This defines an interface to a stateful Iterator that can replay elements added to it directly. Note that this does not extend Iterator.

“直接添加回放元素”是什么意思？这个迭代器与普通迭代器有何不同？

Answer 1

以下是有关有状态迭代器的更多信息:

http://en.wikipedia.org/wiki/Iterator (查看生成器)

这里还有一些进一步的信息:

http://www.itmaybeahack.com/book/python-2.6/html/p02/p02c08_generators.html

终于到了:

http://www.devdaily.com/java/jwarehouse/trove-1.1b3/src/gnu/trove/TIntIntIterator.java.shtml

As the iteration is stateful, access to the key/value parts of the current map entry happens in constant time.

希望这对您有所帮助。