Java 关闭 ByteArrayOutputStream 没有效果？
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Closing a ByteArrayOutputStream has no effect?
提问by user256239
What does this statement, "Closing a ByteArrayOutputStreamhas no effect" (http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close()) mean?
“关闭 aByteArrayOutputStream无效”（http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close()）这句话是什么意思？
I want to make sure the memory in ByteArrayOutputStreamgets released. Does ByteArrayOutputStream.close()really release the memory?
我想确保ByteArrayOutputStream释放内存。难道ByteArrayOutputStream.close()真的释放内存？
Thanks.
谢谢。
采纳答案by Michael Borgwardt
Does ByteArrayOutputStream.close() really release the memory?
ByteArrayOutputStream.close() 真的释放内存了吗？
No. It does absolutely nothing. You can look at its source code:
不，它完全没有任何作用。你可以看看它的源代码：
public void close() throws IOException {
}
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.
要释放内存，请确保没有对它的引用并让垃圾收集器完成它的工作。就像任何其他普通物体一样。
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.
基于文件和基于套接字的流很特别，因为它们使用非内存操作系统资源（文件句柄），您可以独立地用完这些资源。这就是为什么明确关闭它们很重要。但这不适用于纯粹基于内存的ByteArrayOutputStream.
