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    <p>I am assuming that the reason for calling Runtime.getRuntime().exec(f.getPath()); is to open up the abc.txt file in a text editor. It would be better to provide complete command for opening the text editor along with the file path. I tried this with notepad.exe (windows) and it worked.</p> <pre><code>import java.io.*; public class Demo{ public static void main(String[] args){ File f = new File("abc.txt") ; try{ System.setOut(new PrintStream( new FileOutputStream(f) ) ) ; } catch(FileNotFoundException fnfe){ System.out.println(fnfe.getMessage()) ; } System.out.println("Hello\n") ; try{ Process p = Runtime.getRuntime().exec("notepad.exe " + f.getPath()) ; } catch(IOException io){ System.out.println(io.getMessage()) ; } } } </code></pre> <p>Following code dynamically generates java code and uses javac to compile it</p> <pre><code>import java.io.*; public class Demo{ public static void main(String[] args){ File f = new File("Abc.java") ; PrintWriter writer = null; BufferedReader reader = null; InputStream pStream = null; try{ // Open File Stream and write code writer = new PrintWriter( new FileOutputStream(f) ); String javaCode = "public class Abc { \r\n" + "public static void main(String[] args) {\r\n" + "System.out.println(\"Hello World!\");\r\n" + "}\r\n" + "}\r\n"; writer.println(javaCode) ; writer.close(); // Run Javac to compile the code Process p = Runtime.getRuntime().exec("javac " + f.getPath()) ; p.waitFor(); // status = 0 =&gt; Process executed without errors // = 1 =&gt; Process executed with errors int status = p.exitValue(); if( status == 0 ) { pStream = p.getInputStream(); } else { pStream = p.getErrorStream(); } // Display the output from the process reader = new BufferedReader(new InputStreamReader(pStream)); String ln = null; while( (ln = reader.readLine()) != null ) { System.out.println(ln); } } catch(Exception ex){ System.out.println(ex.getMessage()) ; } finally{ try{ if( writer != null ){writer.close();} if( pStream != null ){pStream.close();} if( reader != null ){reader.close();} } catch(Exception ex){ System.out.println(ex.getMessage()) ; } } } } </code></pre>
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    1. COthnx Babar, it's working, but can u also explain this to me:- Cannot run program "D:\shanu\java": CreateProcess error=32, The process cannot access the file because it is being used by another process
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    2. COLooks like you are working on some IDE like application that can compile and run the code, right ? In that case 1- Instead of redirecting System.out to file stream it will be more clean if you directly use the file stream to write the code in file. 2- Basically, open file stream, write all code in file and then close file stream 3- Run the Javac/Java on newly created file.
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    3. COagreed... but i find myself struggling to reslove that Process p = Runtime.getRuntime().exec("notepad.exe " + f.getPath()) ; works fine, but, Process p = Runtime.getRuntime().exec(f.getAbsolutePath()) ; throws an exception, and the logic behind the exception is not getting clear to me.
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