HashSet、TreeSet、LinkedHashSet HashSet、TreeSet、LinkedHashSet Set set接口是一种不包括重复元素的Collection,它维持它自己的内部排序,所以随机访问没有任何意义。 1.HashSet 底层其实就是HashMap,只是用一个空的Object对象作为HashMap的value。 方法 调用的就是HashMap的方法 迭代器 底层调用HashMap的keySet...
public static void main(String args[]) { Set sethash = new HashSet(); for (int i = MAX; i >= MIN; i--) { sethash.add(new Integer(i*i)); } System.out.println("HashSet = " + sethash); Set setlink = new LinkedHashSet(); for (int i = MAX; i >= MIN; i--) { se...
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...
LinkedHashSetis in some sense intermediate between HashSet and TreeSet. Implemented as aHashTablewith a linked list running through it, however it provides insertion-ordered iteration which is not same as sorted traversal guaranteed by TreeSet. So choice of usage depends entirely on your needs bu...
In this article we are gonna discuss the differences betweenHashSetandHashMapclasses. HashSet vs HashMap Differences: Similarities: 1) Both HashMap and HashSet are not synchronized which means they are not suitable for thread-safe operations unitl unless synchronized explicitly. This is how you ...
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ArrayList and LinkedList are the two most popular used List implementations while LinkedHashSet, TreeSet, and HashSet are frequently used Set implementations. In this Java article, we will see the difference between Map, Set, and List in Java and learn when to use List, Set, or Map. ...
Set implementations:HashSet,LinkedHashSet,TreeSetetc. 4) List allows any number of null values. Set can have only a single null value at most. 5)ListIteratorcan be used to traverse a List in both the directions(forward and backward) However it can not be used to traverse a Set. We ca...
TheLinkedListis adoubly linked listimplementation in Java. Every object in the linkedlist is wrapped in aNodeinstance: transientNode<E>first;transientNode<E>last;privatestaticclassNode<E>{Eitem;Node<E>next;Node<E>prev;} TheArrayListhas been implemented as adynamically resizing array. This will le...