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POAccessing a file object outside a try/catch block that creates it (Java)
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  1. POAccessing a file object outside a try/catch block that creates it (Java)
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    copied!<p>I want to create a RandomAccessFile object (in Java) and both write to it and read to it. My problem is that, as far I know I seem to need to create the file within a try/catch block. If I try to create it outside a try/catch block and then initialize it within the block like this, </p> <pre><code>RandomAccessFile valueFile; try { valueFile = new RandomAccessFile("valuefile.txt", "rw"); for (int i=0; i&lt;numOfNums; i++) valueFile.writeDouble(randomizer.nextDouble()*200); } catch (Exception e) { System.out.println("Couldn't find the values file."); System.exit(0); } for (int i=0; i&lt;numOfNums; i++) { double total = 0; valueFile.seek(0); // go to beginning of file to start reading it. } </code></pre> <p>then I get the error "unreported exception java.io.IOException; must be caught or declared to be thrown". (I also get "variable valueFile might not have been initialized".)</p> <p>But when I <em>do</em> create it within try/catch, like this,</p> <pre><code>try { RandomAccessFile valueFile = new RandomAccessFile("valuefile.txt", "rw"); for (int i=0; i&lt;numOfNums; i++) valueFile.writeDouble(randomizer.nextDouble()*200); } catch (Exception e) { System.out.println("Couldn't find the values file."); System.exit(0); } for (int i=0; i&lt;numOfNums; i++) { double total = 0; valueFile.seek(0); } </code></pre> <p>I get "cannot find symbol: variable valueFile" on the later part of the program. I presume that that's because valueFile is considered local to the try/catch block? But then how do I create valueFile so it's <em>not</em> local to the try/catch block?</p>
 

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