本文介绍了Java中的HashSet如何工作?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 限时删除!!有人可以向我是如何使用Java中的HashSets以及为什么它们比使用ArrayLists更快?Can someone explain to me how HashSets in java work and why they are faster than using ArrayLists?推荐答案首先, HashSet ,与 ArrayList 不同,是设置:它不能包含重复项,而 ArrayList 可以 - 所以它们是为不同目的而构建的。它也不保证订购 - 再次,不像列表。First, HashSet, unlike ArrayList is a Set: It cannot contain duplicates while ArrayList can - so they are built for different purposes. It also does not guarantee ordering - again, unlike a list.第二 - HashSet 建立在哈希表数据结构,允许 O(1)为元素寻找时间。Second - a HashSet is built on the hash table data structure, that allows O(1) seek time for an element.注意很多次, HashSet 慢然后是一个 ArrayList - 如果你想在元素上迭代 - 通常在 ArrayList中执行 code>会比 HashSet 更快[因为哈希的缓存性能不佳等原因]Note that many times, a HashSet is slower then an ArrayList - if you want to iterate on elements for example - usually doing it in an ArrayList will be faster then in a HashSet [because of bad cache performance of hash, among other reasons] 这篇关于Java中的HashSet如何工作?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 1403页,肝出来的..
09-06 09:55