英文:
In order to release memory, what can I do after new a File instance in Java?
问题
在某些情况下，我需要在Java中操作Word文档，通常我需要创建一个新的文件实例，就像：
File file = new File("路径/到/目标/文件");
在我使用完它后，是否需要做些什么来释放内存？
file = null;
似乎效果不太好。
英文:
In some case, I need to operator Doc file in Java, I usually need new a File instance, like:
File file = new File("path/to/target/file");
should I do somethine after I use it for release memory?
file = null;
seems not work well.
答案1
得分: 1
file = null; [可能] 不会产生任何影响，只要你用于打开文件的流或读取器仍然存在，因为该流或读取器 [可能] 会持有对该 File 的引用。无论如何，在内存消耗的更大图景中，一个 File 实例基本上微不足道；如果一个 File 对象的持续存在与否会决定你的程序存亡，那几乎是不可能的。
尽管如此，在你不再需要该 File 实例时执行 file = null; 当然是没有害处的。但是，如果可用内存不立即增加几个字节，不要感到惊讶或担心！
英文:
file = null; [probably] won't do anything as long as the stream or reader you used to open the file still exists because that stream or reader [probably] will hold a reference to that File. And anyway, a File is virtually nothing in the bigger picture of memory consumption; it's highly unlikely your program will live or die over the continued existence of a single File object.
That said, there's certainly no harm in doing file = null; when you have no further use for that File instance. Just don't be either surprised or worried if the available memory doesn't instantly jump up by a few bytes!
答案2
得分: 1
首先，File 实例不仅仅是文件名。它的内存占用极小。
Java 拥有一个垃圾收集器，将负责回收未使用（不可访问）的对象。您无需在您的一侧执行任何特殊操作。
英文:
First, a File instance is not much more than the file name. Its memory footprint is negligible.
Java has a garbage collector that will take care of reclaiming unused (unreachable) objects. There is no special action necessary on your side.
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