nio and getRuntime()

I am using Runtime.exec() to compile a .c file with gcc. Sample program is

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/** * Call the <strong>gcc</strong> compiler. Create two {@link EiffelFileReader.StreamEater} objects which * put all the messages from it into {@link List} objects for printing later if necessary. */ public void compile() { List<String> errorList, outputList; errorList = new ArrayList<String>(3); outputList = new ArrayList<String>(3); int endIndex, returnValue; String filePath, fileName; String instruction = "gcc -o "; try { fileName = outputFile.getCanonicalPath(); endIndex = fileName.lastIndexOf(File.separator); filePath = fileName.substring(0, endIndex + 1); instruction += filePath; instruction += JOptionPane.showInputDialog(null, "Please enter Name for output File.\n\".exe\" added automatically in Windows" + "\nThe same directory will be used as for the \".c\" file.", "Output", JOptionPane.QUESTION_MESSAGE); if (System.getProperty("os.name").toLowerCase().contains("windows")) { instruction += ".exe"; } // end if System.getProperty("OS").toLowerCase().contains("win") instruction += " "; instruction += fileName; Runtime run = Runtime.getRuntime(); Process myProcess = run.exec(instruction); /* * You need to redirect the output and error streams from the process. */ new StreamEater(myProcess.getErrorStream(), errorList).start(); new StreamEater(myProcess.getInputStream(), outputList).start(); /* Allow a 1-second delay to make sure the previous Threads have completed. */ returnValue = myProcess.waitFor(); Thread.sleep(1000); if (returnValue == 0) { out.printf("No errors reported%s%n", errorList.size() > 0 ? ". There are warnings however." : "."); } // end if returnValue == 0 else { out.printf("Returned with a value of %d%n", returnValue); } // end else out.println("<OUTPUT>"); for (String string : outputList) { out.println(string); } // end for-each out.println("</OUTPUT>"); out.println("<ERRORS>"); for (String string : errorList) { out.println(string); } // end for-each out.println("</ERRORS>"); }//end try catch (IOException exc) { err.println("Error occurred trying to find the files"); exc.printStackTrace(err); } // end catch IOException catch (InterruptedException exc) { exc.printStackTrace(err); } }//end compile . . . /** * This class takes all the messages from a particular {@link InputStream} using * a {@link Scanner} and puts them into a {@link List} so they can be printed later. * This is necessary because the {@link Runtime#exec(String)} method takes a little * time to operate, and its output streams have to be diverted. * <a href=http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=4>M C Daconta * <i>When Runtime.exec() won't</i> Javaworld magazine, 29th September 2000.</a> * @author Campbell * */ private class StreamEater extends Thread { /** * A {@link List} which the output is put into */ private List<String> myList; /** * An {@link InputStream} which is diverted to this class */ private InputStream myStream; /** * A {@link Scanner} which readds from the {@link InputStream}. */ private Scanner myScan; /** * Create an object of {@link EiffelFileReader.StreamEater}. * @param myStream The {@link InputStream} used by this StreamEater * @param myList The {@link List} which the output is put into */ public StreamEater(InputStream myStream, List<String> myList) { super(); this.myStream = myStream; this.myList = myList; }//end constructor /** * Opens the {@link InputStream} with a {@link Scanner} and reads all the output * into the {@link List} object passed. Then closes the {@link Scanner} and handles * any {@link IOException} which might have occurred. */ @Override public void run() { try { try { myScan = new Scanner(myStream); while(myScan.hasNext()) myList.add(myScan.nextLine()); if (myScan.ioException() != null) { throw myScan.ioException(); } // end if myScan.ioException() != null } // end try finally { if (myScan != null) { myScan.close(); } // end if myScan != null// Fill in finally block, close reader, etc } // end finally } // end try catch (IOException exc) { System.err.printf("Error occurred trying to read output from Runtime.exec()%n"); exc.printStackTrace(err); } // end catch IOException }//end run }//end private stream eater class}//end class
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