arraylist（可变数组）,linkedlist（底层链表结构）,hashset（底层哈希表）,treeset（底层二叉树）都有相应...
原文网址:http://blog.csdn.net/cool_sti/article/details/21658521 原英文链接:http://javarevisited.blogspot.hk/2014/03/how-to-clone-collection-in-java-deep-copy-vs-shallow.html 程序员通常会误用集合类(如List、Set、ArrayList、HashSet)所提供的拷贝构造函数或其它方法来完成集合的拷贝。值得记住的一点是...
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Remove, Contains, but since it uses a hash-based implementation, these operation are O(1). (As opposed to List<T> for example, which is O(n) for Contains and Remove.) HashSet also provides standard set operations such as union, intersection, and symmetric difference....
It accepts not only HashSet, but all the Collections typesi.e.ArrayList,LinkedList,HashSet. If the specified collection is also a set, this operation effectively modifies this set so that its value is theasymmetric set differenceof the two sets. ...
All ordered containers provide stateful iterators and some of them allow enumerable functions. DataStructureOrderedIteratorEnumerableReferenced by Lists ArrayList yes yes* yes index SinglyLinkedList yes yes yes index DoublyLinkedList yes yes* yes index Sets HashSet no no no index TreeSet yes yes* ...
All ordered containers provide stateful iterators and some of them allow enumerable functions. DataStructureOrderedIteratorEnumerableReferenced by Lists ArrayList yes yes* yes index SinglyLinkedList yes yes yes index DoublyLinkedList yes yes* yes index Sets HashSet no no no index TreeSet yes yes* ...
获取空集对象(没有元素的集合,注意集合不为null): 常用的集合类: HashSet/ArrayList/HashMap都是线程不安全的,在多线程环境下不安全. 在Collections类中有获取线程安全的集合方法: List list Java 集合系列16之 HashSet详细介绍(源码解析)和使用示例 ://www.cnblogs.com/skywang12345/p/3311252.html 第1部分 ...
一.开头先总结一下: ①你不需要可变容器的功能,首选数组(数组比所有容器都快) ②一般情况下,没特别需要,选ArrayList(遍历速度很快) ③如经常需要往List中间插入数据或删除数据,选LinkedList ④对于set集合,首选HashSet(添加和查询速度很快) ⑤对于set集合,如果需要排序,选择TreeSet ⑥对于set集合,LinkedHashSet遍历更...
we are going to perform a performance comparison between the three probably most usedCollectionimplementation classes. To make things more realistic we are going to test against a multi–threading environment so as to discuss and demonstrate how to utilizeVector,ArrayListand/orHashSetfor high performan...