What does this statement, "Closing a ByteArrayOutputStream has no effect" (http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close()) mean?
这句话“关闭ByteArrayOutputStream无效”（http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close（））是什么意思？
I want to make sure the memory in ByteArrayOutputStream gets released. Does ByteArrayOutputStream.close() really release the memory?
我想确保释放ByteArrayOutputStream中的内存。 ByteArrayOutputStream.close（）真的释放内存吗？
Thanks.
谢谢。
1 个解决方案
#1
77
Does ByteArrayOutputStream.close() really release the memory?
ByteArrayOutputStream.close（）真的释放内存吗？
No. It does absolutely nothing. You can look at its source code:
不，它绝对没有。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，并让垃圾收集器执行其操作。就像任何其他普通对象一样。
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），这些资源可以独立于内存耗尽。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。
#1
77
Does ByteArrayOutputStream.close() really release the memory?
ByteArrayOutputStream.close（）真的释放内存吗？
No. It does absolutely nothing. You can look at its source code:
不，它绝对没有。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，并让垃圾收集器执行其操作。就像任何其他普通对象一样。
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），这些资源可以独立于内存耗尽。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。