哪些Java集合是同步的（线程安全的），哪些不是？ [英] Which Java Collections are synchronized(thread safe), which are not?

问题描述

哪些Java集合是同步的？

Which Java Collections are synchronized, which are not?

示例：哈希集未同步

推荐答案

有三组Collection。

There are three groups of Collections.

• Java 1.0集合主要是遗留类。这包括哈希表，向量，堆栈。它们是同步的，但我不建议您使用它们。属性也许是一个例外，但是我不会在多线程上下文中使用它。


• 1998年添加的Java 1.2集合在很大程度上取代了这些集合，它们不是同步的，但是可以同步使用 Collections.synchronizedXxx（）方法


• 2004年添加的Java 5.0并发集合支持无锁，线程安全的集合。

• Java 1.0 collections which mostly legacy classes. This includes Hashtable, Vector, Stack. These are synchronized but I don't recommend you use them. Properties is perhaps one exception, but I wouldn't use it in a multi-threaded context.
• Java 1.2 collections added in 1998 which largely replaced these collection are not synchronized, but can be synchronized using Collections.synchronizedXxx() methods
• Java 5.0 concurrency collections added in 2004 support lock free, thread safe collections.

简而言之，我建议您使用的所有集合都不是同步的。

In short, none of the collections I would recommend you use are synchronized.

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