Content deleted Content added
→Set interfaces: Fix subheading issues |
→Map interfaces: Add information about EnumMap |
||
Line 241:
The direct subclasses of {{java|AbstractMap}} class include {{java|ConcurrentSkipListMap}}, {{java|EnumMap}}, {{java|HashMap}}, {{java|IdentityHashMap}}, {{java|TreeMap}} and {{java|WeakHashMap}}.
=====EnumMap=====
{{java|EnumMap}} extends {{java|AbstractMap}}. {{java|EnumMap}} has comparable speed with an ordinal-indexed array.{{sfn|Bloch|2018|loc=Chapter §6 Item 36: Use EnumMap instead of ordinal indexing|pp=171-175}} This is because {{java|EnumMap}} internally uses an array, with implementation details completely hidden from the developer.{{sfn|Bloch|2018|loc=Chapter §6 Item 36: Use EnumMap instead of ordinal indexing|pp=171-175}} Hence, the EnumMap gets the type safety of a {{java|Map}} while the performance advantages of an array.{{sfn|Bloch|2018|loc=Chapter §6 Item 36: Use EnumMap instead of ordinal indexing|pp=171-175}}
=====HashMap=====
| |||