是否可以在Java中合并迭代器？ [英] Is it possible to merge iterators in Java?

问题描述

是否可以在Java中合并迭代器？我有两个迭代器，我想组合/合并它们，以便我可以一次性迭代它们的元素（在同一个循环中）而不是两个步骤。那可能吗？

Is it possible to merge iterators in Java? I have two iterators and I want to combine/merge them so that I could iterate though their elements in one go (in same loop) rather than two steps. Is that possible?

请注意，两个列表中的元素数量可能不同，因此两个列表中的一个循环不是解决方案。

Note that the number of elements in the two lists can be different therefore one loop over both lists is not the solution.

Iterator<User> pUsers = userService.getPrimaryUsersInGroup(group.getId());
Iterator<User> sUsers = userService.getSecondaryUsersInGroup(group.getId());

while(pUsers.hasNext()) {
  User user = pUsers.next();
  .....
}

while(sUsers.hasNext()) {
  User user = sUsers.next();
  .....
}

推荐答案

Guava （以前称为Google Collections）有 Iterators.concat 。

Guava (formerly Google Collections) has Iterators.concat.

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