Collections.synchronizedList和synchronized [英] Collections.synchronizedList and synchronized

问题描述

List<String> list = Collections.synchronizedList(new ArrayList<String>());
synchronized (list) {
    list.add("message");
}

/ p>

Is the block "synchronized (list){} " really need here ?

推荐答案

您不需要像在示例中那样进行同步。但是，非常重要的是，当你迭代它时，你需要在列表之间同步（如Javadoc中所述）：

You don't need to synchronize as you put in your example. HOWEVER, very important, you need to synchronize around the list when you iterate it (as noted in the Javadoc):

用户在返回的
列表上手动同步它：

It is imperative that the user manually synchronize on the returned list when iterating over it:

List list = Collections.synchronizedList(new ArrayList());
...
synchronized(list) {
    Iterator i = list.iterator(); // Must be in synchronized block
    while (i.hasNext())
        foo(i.next());   
}

这篇关于Collections.synchronizedList和synchronized的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！