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POTrying to print the lines after writing them to an ouput file (java)
 

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  1. POTrying to print the lines after writing them to an ouput file (java)
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    <p>I have a problem. I'm basically asked to use a method to print from an output file. So to start off I actually began filling the output file with lines..then when I tried to actually read them and print them on the screen there was a slight problem. I actually used the 'debug' option and the problem turned out to be within the ' line = input.nextLine()' line of code but i don't really know why..I mean that's how we get to read from an output file...help would be appreciated.</p> <p>Here's my work so far:</p> <pre><code>import java.util.*; import java.io.*; public class Problem_3 { public static void main(String[] args) { PrintWriter outFile = null; File f1 = new File("try.txt"); try { outFile = new PrintWriter("try.txt"); outFile.println("First line!"); outFile.println("Second line!"); outFile.println("Third line!"); cat(f1); } catch (Exception e) { outFile.print("(1) Exception: " + e.getMessage()); // no such element exception } outFile.close(); } /* * outFile = new PrintWriter(f1); outFile.println("Line 1"); * outFile.println("Line 2"); outFile.println("Line 3"); outFile.print(""); * cat(f1); } catch (Exception e) { System.out.println("(1)Exception: " + * e.getMessage()); } outFile.close(); } */ public static void cat(File file) throws FileNotFoundException { Scanner input = null; String line = ""; input = new Scanner(new FileReader(file)); //line = input.next(); // line = input.nextLine();// this line calls the exception in the main method while ((line != null)) { System.out.println("In the while loop"); System.out.println("Line 323" + line); return; } input.close(); } } </code></pre>
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    1. PO
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    1. PTQuestion
    1. USSome programmer dude
    1. USScarl
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    1. This table or related slice is empty.
    1. COYou might want to close the file *before* trying to read from it. Reason being that the buffer might not be flushed yet so there's actually nothing in the file yet when you try to read it.
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      1. POTrying to print the lines after writing them to an ouput file (java)
      1. USSome programmer dude
    2. CO"There was a slight problem" - what problem? You talk about "this line calls the exception" - what exception? An exception is *thrown* and *caught*, not called.
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      1. POTrying to print the lines after writing them to an ouput file (java)
      1. USJon Skeet
    3. COI did that, but it actually didn't work
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      1. POTrying to print the lines after writing them to an ouput file (java)
      1. USScarl
 

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