问题描述
这句话是什么，关闭 ByteArrayOutputStream 无效（）是什么意思？
What does this statement, "Closing a ByteArrayOutputStream has no effect" (http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close()) mean?
我想确保释放 ByteArrayOutputStream 中的内存。 ByteArrayOutputStream.close（）真的释放内存吗？
I want to make sure the memory in ByteArrayOutputStream gets released. Does ByteArrayOutputStream.close() really release the memory?
谢谢。
推荐答案
没有。它什么都没做。您可以查看其源代码：
No. It does absolutely nothing. You can look at its source code:
public void close() throws IOException {
}
要释放内存，请确保没有引用它并让垃圾收集器执行其操作。就像任何其他普通对象一样。
To release the memory, make sure there are no references to it and let the Garbage Collector do its thing. Just like with any other normal object.
基于文件和套接字的流是特殊的，因为它们使用非内存操作系统资源（文件句柄），你可以用完独立的记忆。这就是为什么明确地关闭它们很重要。但这不适用于纯粹基于内存的 ByteArrayOutputStream 。
File- and Socket-based streams are special because they use non-memory OS resources (file handles) that you can run out of independantly of memory. That's why closing them explicitly is important. But this does not apply to the purely memory-based ByteArrayOutputStream.
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