Java 提供了几个有用的 java.util.Map 接口实现,例如 HashMap、TreeMap 和 LinkedHashMap,它们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。
The Java program below shows the implementation of LinkedHashMap by demonstrating the methods discussed above. import java.util.*; public class Main { public static void main(String a[]) { //declare LinkedHashMap and initialize it with values LinkedHashMap<String, String> colors_map = new Li...
linkedHashMap.put(d3,5); linkedHashMap.put(d4,20); for (Entryentry :linkedHashMap.entrySet()) { System.out.println(entry.getKey()+" - "+entry.getValue()); } } } Output is: reddog–10 blackdog–15 whitedog–20 The difference is that if we use HashMap the output could be the...
likeLinkedHashMapwhich guarantee insertion order (the order in which mappings are added into the map), andTreeMapwhich is a sorted map, and sort objects in their natural order of any order imposed by provided Comparator. See thedifference between HashMap, Tree...
Performance is likely to be just slightly below that of ComcurrentHashMap, due to the added expense of maintaining the linked list, with one exception: Iteration over the collection-views of a ConcurrentLinkedHashMap requires time proportional to the size of the map, regardless of its capacity....
The feature that distinguishes HashMap and LinkedHashMap from each other is that Hashmap does not maintain the order of the stored entries in a map. On the other hand, LinkedList uses a hybrid data structure to maintain the order of entries in which they
LinkedHashMap : {USA=Washington, United Kingdom=London, India=New Delhi} TreeMap : {India=New Delhi, USA=Washington, United Kingdom=London} HashMap : {United Kingdom=London, USA=Washington, India=New Delhi} 3. 性能 假设哈希方法将元素正确地分散在桶中,HashMap和LinkedHashMap优惠O(1)对于 ...
Java는 기능면에서 다소 유사한 HashMap, TreeMap 및 LinkedHashMap과 같은 java.util.Map 인터페이스의 몇 가지 유용한 구현을 제공합니다. 이 게시물에서는 이러한 구현