Java 集合框架：Big-O 實作綜合指南
在Java 集合框架中，每個集合都有其獨特的效能特徵透過其底層資料結構。了解這些操作的 Big-O 複雜度可以指導資料結構的有效選擇和最佳化。
列表實作
| Operation | ArrayList | LinkedList | CopyOnWrite-ArrayList |
|---|---|---|---|
| get | O(1) | O(n) | O(1) |
| add | O(1) | O(1) | O(n) |
| contains | O(n) | O(n) | O(n) |
| next | O(1) | O(1) | O(1) |
| remove(0) | O(n) | O(1) | O(n) |
| iterator.remove | O(n) | O(1) | O(n) |
清單實作
| Operation | HashSet | LinkedHashSet | CopyOnWriteArraySet | EnumSet | TreeSet | ConcurrentSkipListSet |
|---|---|---|---|---|---|---|
| add | O(1) | O(1) | O(n) | O(1) | O(log n) | O(log n) |
| contains | O(1) | O(1) | O(n) | O(1) | O(log n) | O(log n) |
| next | O(h/n) | O(1) | O(1) | O(1) | O(log n) | O(1) |
地圖實作
| Operation | HashMap | LinkedHashMap | IdentityHashMap | EnumMap | TreeMap | ConcurrentHashMap | ConcurrentSkipListMap |
|---|---|---|---|---|---|---|---|
| get | O(1) | O(1) | O(1) | O(1) | O(log n) | O(1) | O(log n) |
| containsKey | O(1) | O(1) | O(1) | O(1) | O(log n) | O(1) | O(log n) |
| next | O(h/n) | O(1) | O(h/n) | O(1) | O(log n) | O(h/n) | O(1) |
隊列實作
| Operation | PriorityQueue | ConcurrentLinkedQueue | ArrayBlockingQueue | LinkedBlockingQueue | PriorityBlockingQueue | DelayQueue | LinkedList | ArrayDeque | LinkedBlockingDeque |
|---|---|---|---|---|---|---|---|---|---|
| offer | O(log n) | O(1) | O(1) | O(1) | O(log n) | O(log n) | O(1) | O(1) | O(1) |
| peek | O(1) | O(1) | O(1) | O(1) | O(1) | O(1) | O(1) | O(1) | O(1) |
| poll | O(log n) | O(1) | O(1) | O(1) | O(log n) | O(log n) | O(1) | O(1) | O(1) |
| size | O(1) | O(n) | O(1) | O(1) | O(1) | O(1) | O(1) | O(1) | O(1) |
其他資源
以上是Java Collection Framework 實作的 Big-O 複雜度如何影響效能？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
