trouble with ProcessBuilder <pre><code>// following code works fine n open notepad... class demo { public static void main(String args[]) { try{ ProcessBuilder pb=new ProcessBuilder("notepad"); pb.start(); }catch(Exception e) {System.out.print(e);} } } //however the above code throws an exception when any other system program is executed class demo { public static void main(String args[]) { try{ ProcessBuilder pb=new ProcessBuilder("calculator"); pb.start(); }catch(Exception e) {System.out.print(e);} } } </code></pre> <p>the above program throws following exception:</p> <pre><code>java.io.IOException: Cannot run program "Calculator": CreateProcess error=2, The system cannot find the file specified </code></pre>