如果只有一个线程正在写入Java中的同步列表/映射 [英] Synchronized List/Map in Java if only one thread is writing to it

问题描述

第一个线程正在用对象连续填充集合。第二个线程需要遍历这些对象，但不会更改集合。

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.

当前，我使用 Collection.synchronized 使其具有线程安全性，但是有快速的方法吗？

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

很简单：只要按下鼠标按钮，第一个线程（ui）就会连续将鼠标位置写入ArrayList。第二个线程（渲染）根据列表绘制一条线。

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

即使同步列表，也不一定是线程-safe进行迭代，因此请确保对其进行同步：

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：

关于此事，这是一篇非常清晰的文章：
http://java67.blogspot.com/2014/12/how-to-synchronize-arraylist-in-java.html

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