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copied!<p>Your <code>DataOutputStream</code> inherits it's <code>close()</code>-method from <code>FilterOutputStream</code> whom's <a href="http://docs.oracle.com/javase/6/docs/api/java/io/FilterOutputStream.html#close%28%29" rel="nofollow">documentation</a> states that:</p> <blockquote> <p>Closes this output stream and <strong>releases any system resources associated with the stream.</strong></p> <p>The close method of FilterOutputStream calls its flush method, and <strong>then calls the close method of its underlying output stream.</strong></p> </blockquote> <p>The same should be true for all <code>Writer</code>-implementations (although it's not stated in the docs).</p> <hr> <p>To avoid running into memory problems when working with Streams in Java, use this pattern:</p> <pre><code>// Just declare the reader/streams, don't open or initialize them! BufferedReader in = null; try { // Now, initialize them: in = new BufferedReader(new InputStreamReader(in)); // // ... Do your work } finally { // Close the Streams here! if (in != null){ try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } </code></pre> <p>This looks less messy with Java7 because it introduces the <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html" rel="nofollow"><code>AutoCloseable</code>-interface</a>, which is implemented by all Stream/Writer/Reader classes. See the <a href="http://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html" rel="nofollow">tutorial</a>.</p>

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