如果只有一个线程正在写入它在Java中的Synconisized List / Map [英] Synconisized List/Map in Java if only one thread is writing to it

问题描述

第一个线程是用对象连续填充一个集合。第二个线程需要遍历这些对象，但它不会改变集合。

The first thread is filling a collection continuously with objects. A second thread needs to iterate over these objects, but it will not change the collection.

目前我使用Collection.synchronized ...使它线程安全，但是有很快的方法吗？

Currently I use Collection.synchronized... for making it thread-safe but is there a fast way to doing it?

很抱歉，没有给出我的上下文的一些信息：

Sorry for not giving some information about my context:

：第一个线程（ui）连续地将鼠标位置写入ArrayList，只要按下鼠标按钮。第二个线程（render）根据列表绘制一行。

It's simple: The first thread (ui) continuously writes the mouse position to the ArrayList, as long as the mousebutton is pressed down. The second thread (render) draws a line based on the list.

推荐答案

即使你同步列表， -safe同时迭代它，所以请确保你同步它：

Even if you synchronize the list, it's not necessarily thread-safe while iterating over it, so make sure you synchronize on it:

synchronized(synchronizedList) {
    for (Object o : synchronizedList) {
        doSomething()
    }
}

< h3>编辑：

这是一篇很清楚的文章：
http://java67.blogspot.com/2014/12/how-to-synchronize-arraylist-in-java.html

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