HashSet, TreeSet 和LinkedHashSet 是最常用的实现 Set 接口,恰好在功能上或多或少相似。这篇文章概述了这些实现之间的一些主要差异。 1. 实施细节 一个HashSet 实现由哈希表支持,使用 HashMap 实例。一个 TreeSet 实现是基于一个 TreeMap 实现为红黑树,以及 LinkedHashSet 使用哈希表和双向链表实现。 两个都...
TreeSet obj = new TreeSet(); HashSet、LinkedHashSet和TreeSet根据插入顺序和所用时间的区别: Java // Java program to demonstrate difference between // HashSet, LinkedHashSet and TreeSet according // to insertion order and insertion time importjava.util.Arrays; importjava.util.HashSet; importjav...
While searching solution for myJava exceptiononline found very nice explanation on StackOverflow about some basic difference between HashSet and TreeSet. HashSet is much faster than TreeSet (constant-time versus log-time for most operations like add, remove and contains) but offers no ordering gua...
Set表示一个通用的“值集”。TreeSet是一个元素被排序（并因此排序）的集合，HashSet是一个元素被排序...
HashSet is a good choice for representing sets if you don't care about element ordering. But if ordering is important, then LinkedHashSet or TreeSet are better choices. However, LinkedHashSet or TreeSet come with an additional speed and space cost....
e.g.SortedSet<String> s = new TreeSet<String>(hashSet); Mapis an important data structure. 1. Map Overview There are 4 commonly used implementations of Map in Java SE - HashMap, TreeMap, Hashtable and LinkedHashMap. If we use one sentence to describe each implementation, it would be...
那么，当您谈到TreeSet和HashSet的性能时，您应该清楚地了解这些结构是如何组织的--其组织的后果是什么...
HashSetallows a null value, whereasTreeSetsupports null value only if its Comparator supports comparison on null (natural ordering doesn’t allow null). That’s all about differences between theHashSetandTreeSetin Java. References: 1.HashSet – Javadoc SE 9 ...
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TreeSet Here are the major differences between LinkedHashSet and TreeSet: The TreeSet class implements the SortedSet interface. That's why elements in a tree set are sorted. However, the LinkedHashSet class only maintains the insertion order of its elements. A TreeSet is usually slower than...