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POprintf() functionality in Java combined with a CharBuffer or something like it
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  1. POprintf() functionality in Java combined with a CharBuffer or something like it
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    copied!<p>I am a little confused here.</p> <p>I would like to do something like this:</p> <ol> <li>create some kind of buffer I can write into</li> <li>clear the buffer</li> <li>use a printf()-like function several times to append a bunch of stuff into the buffer based on some complicated calculations I only want to do once</li> <li>use the contents of the buffer and print it to several <code>PrintStream</code> objects</li> <li>repeat steps 2-4 as necessary</li> </ol> <p>e.g.:</p> <pre><code>SuperBuffer sb = new SuperBuffer(); /* SuperBuffer is not a real class, so I don't know what to use here */ PrintStream[] streams = new PrintStream[N]; /* ... initialize this array to several streams ... */ while (!done) { sb.clear(); sb.printf("something %d something %d something %d", value1, value2, value3); if (some_complicated_condition()) sb.printf("something else %d something else %d", value4, value5); /* ... more printfs to sb ... */ for (PrintStream ps : streams) ps.println(sb.getBuffer()); } </code></pre> <p>It looks like wrapping a <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintWriter.html" rel="nofollow noreferrer">PrintWriter</a> around <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/io/StringWriter.html" rel="nofollow noreferrer">StringWriter</a> will do what I want for the <code>sb</code> object above, except there's no <code>clear()</code> method. I suppose I could create a new PrintWriter and StringWriter object each time through the loop, but that seems like a pain. (in my real code I do this in several places, not just once in one loop...)</p> <p>I've also used <code>java.nio.CharBuffer</code> and other NIO buffers a lot, and that seems like a promising approach, but I'm not sure how I can wrap them with an object that will give me <code>printf()</code> functionality.</p> <p>any advice?</p>
 

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