LinkedHashSet截取
时间: 2023-08-12 22:09:43 浏览: 52
Java LinkedHashSet是Java集合框架中的一种数据结构,它是HashSet的子类,具有HashSet的所有特性,同时还保留了元素插入的顺序。它使用哈希表来存储元素,但是同时使用链表来维护元素的插入顺序。因此,LinkedHashSet既可以快速访问元素,又可以保证元素的顺序。它是一种适合需要保留元素插入顺序的场景下使用的集合。
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LinkedHashSet
LinkedHashSet is a subclass of HashSet in Java that maintains the insertion order of the elements. It extends the HashSet class and implements the Set interface. It is similar to HashSet in terms of storing unique elements but maintains the order in which the elements were inserted.
LinkedHashSet uses a combination of a hash table and a linked list to maintain the elements in the order in which they were inserted. It provides constant time performance for the basic operations such as add, remove, contains, and size.
One of the main advantages of LinkedHashSet over HashSet is that it can be used in scenarios where the order of the elements is important. For example, in a web application, a LinkedHashSet can be used to store the order of the pages that a user has visited.
LinkedHashSet is not synchronized, so it is not thread-safe. However, it can be synchronized using the Collections.synchronizedSet() method to make it thread-safe.
Overall, LinkedHashSet is a useful class in Java that provides the benefits of HashSet along with maintaining the order of the elements.
linkedhashset
LinkedHashSet是Java集合框架中的一种类,它实现了Set接口,同时使用链表维护元素的插入顺序。和HashSet一样,LinkedHashSet也是基于哈希表的,但是它在哈希表的基础上通过链表维护了元素的插入顺序,因此可以保证元素的顺序性。与HashSet相比,LinkedHashSet的插入和删除操作的时间复杂度都是O(1),但是由于需要维护元素的顺序,所以访问操作的时间复杂度比HashSet略慢一些。在实际应用中,如果需要维护元素的插入顺序,可以使用LinkedHashSet;否则可以使用HashSet,因为HashSet的空间效率更高。
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