Java Set保留订单？ [英] Java Set retain order?

问题描述

Java Set是否保留订单？一个方法正在向我返回一个Set，并且假设数据是有序的，但迭代了Set，数据是无序的。有没有更好的方法来管理这个？是否需要更改方法以返回除Set之外的其他内容？

Does a Java Set retain order? A method is returning a Set to me and supposedly the data is ordered but iterating over the Set, the data is unordered. Is there a better way to manage this? Does the method need to be changed to return something other than a Set?

推荐答案

设置 界面不提供任何订购保证。

The Set interface does not provide any ordering guarantees.

其子界面 SortedSet 表示根据某个标准排序的集合。在Java 6中，有两个标准容器实现 SortedSet 。它们是 TreeSet 和 ConcurrentSkipListSet 。

Its sub-interface SortedSet represents a set that is sorted according to some criterion. In Java 6, there are two standard containers that implement SortedSet. They are TreeSet and ConcurrentSkipListSet.

除 SortedSet 界面外，还有 LinkedHashSet 类。它会记住元素插入集合的顺序，并按顺序返回元素。

In addition to the SortedSet interface, there is also the LinkedHashSet class. It remembers the order in which the elements were inserted into the set, and returns its elements in that order.

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