StackOverflow2013

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PO
primarykey
Id
10596680
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-05-15T08:15:14.490
FavoriteCount
0
LastActivityDate
2012-05-15T08:20:29.373
LastEditDate
2012-05-15T08:20:29.373
LastEditorUserId
45664
OwnerUserId
45664
ParentId
10596477
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
Do you ever close the writer? In general, whenever you create an I/O resource (such as a reader/writer/database connection/etc), you should use a <a href="http://docs.oracle.com/javase/tutorial/essential/exceptions/finally.html" rel="nofollow">finally block</a> to ensure it's closed, something like this: <pre><code>Writer writer = new BufferedWriter(...); try { // do something with the writer; may be many lines of code } finally { writer.close(); } </code></pre> (Note: Java 7 has more concise syntax for this pattern, <a href="http://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html" rel="nofollow">the try-with-resources block</a>.) This is important for resource management (for example, if you don't close connections/files then eventually your process will run out of file handles and will not be able to open any more). However, there's a more relevant issue too. Many writers are buffered, to avoid the performance hit of writing one character at a time to the underlying operating system. When you call <code>write</code> on them, they store that data in a buffer, and only actually write it to the file periodically (when it's "big enough" to be worth it) - this is called flushing. If the writer is simply discarded before it has flushed the data, the file won't be updated. You can call <code>flush()</code> manually, but it's rarely needed - calling <code>close()</code> on the writer will not only release all its resources, but will flush the buffers as well. So with the <code>try / finally</code> pattern laid out above, it's guaranteed that whatever you write within the <code>try</code> block will be written to the file when your process terminates. With your current code, there are no guarantees and it depends on the implementation of the writer.
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1. POimport java.util.zip.ZipOutputStream; causing issues with printing to a file
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1. PTAnswer
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1. USAndrzej Doyle
UserOwnerUserId
1. USAndrzej Doyle
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