String.intern（）线程是否安全

问题描述

我想在Java中使用String.intern（）来节省内存（使用内部池来获取具有相同内容的字符串）。我从不同的线程调用此方法。这是一个问题吗？

I would like to use String.intern() in Java to save memory (use the internal pool for strings with the same content). I call this method from different threads. Is it a problem?

推荐答案

对你的问题的简短回答是肯定的。它是线程安全的。

The short answer to your question is yes. It's thread-safe.

但是，您可能想重新考虑使用此工具来减少内存消耗。原因是您无法从实习字符串列表中删除任何entires。更好的解决方案是为此创建自己的设施。您所需要的只是将字符串存储在 HashMap< String，String> 中，如下所示：

However, you might want to reconsider using this facility to reduce memory consumption. The reason is that you are unable to remove any entires from the list of interned strings. A better solution would be to create your own facility for this. All you'd need is to store your strings in a HashMap<String,String> like so:

public String getInternedString(String s) {
    synchronized(strings) {
        String found = strings.get(s);
        if(found == null) {
            strings.put(s, s);
            found = s;
        }
        return found;
    }
}

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