Question

When I tried to use the hashtable class, Netbeans gave me an error saying:

这些班级虽然仍然得到支持,但被JDK1.2收集班所淘汰,可能不应用于新的发展。

However, I can t seem to find an example online on a better replacement for Hashtable. Any suggestions?

Answer 1

http://download.oracle.com/javase/7/docs/api/java/util/Hashtable.html” rel=“nofollow noretinger”>Hashtable 是 rel=“nofollow noretinger”> 代码>HHashap 。

One difference that could be important is that all relevant methods of Hashtable are synchronized while they are not synchronized on HashMap.

Answer 2

http://download.oracle.com/javase/6/docs/api/java/util/Hashtable.html” rel=“noretinger”> 编码: rel=“noretinger”>HashMap/code><<<<>>>。



至于陈旧,我没有提及,但 Java认为:


  As of the Java 2 platform v1.2, this class was retrofitted to
  implement the Map interface, making it a member of the 
  Java Collections Framework.


Hashtable与>: 代码>HashMap/code><<<>>>>><<<<<>>>>>>>>HashMap/code>>>>>>>>>>>>>>><<<<<<<<>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>

Answer 3

你可能使用哈希姆地图:

Map<String, Integer> mymap = new HashMap<String, Integer>();

Answer 4

您应使用Hasmaap,但并不是针对同时的环境设计的,在这种环境中,您可使用 rel=“nofollow”。



页: 1

Map<K,V> myMap = Collections.synchronizedMap(/*any map instance*/);

Answer 5

There are cases when a method outside your control requires an Hashtable. Java s own javax.management.ObjectName is such an example^[1].

When the external interface requires it you have to use Hashtable. In netbeans, you can use:

@SupresssWarnings("UseOfObsoleteCollectionType")

在当地镇压警告。

See See See

1: I wonder why they used Hashtable and not HashMap, since ObjectName is available since 1.5 and Hashtable is obsolete since 1.2

Answer 6

<<>Summary

最近的更换是Hasmaap(通常是通过地图接口)。

但注意到,哈希姆普省的情况并非如此。 www.un.org/Depts/DGACM/index_spanish.htm 在大多数情况下,这不是的问题,而是有意使大多数 Java收集工作变得不易安全,以避免对大多数常见情况处以罚款。但是,如果你依靠哈希姆的翻新安全,现在需要替代,也应当翻新,那么你有两种选择:

If you need a simple synchronization wrapper for an existing Map - use Collections.synchronizedMap(...)
If you need a class carefully and optimally designed for concurrent access - use ConcurrentHashMap (usually via the ConcurrentMap interface that extends the Map interface with additional concurrency features).

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