Java open flie or open folder explorer

    public static void main(String[] args) {
       try{

           Desktop.getDesktop().open(new File("c:\\"));

           } catch (IOException ex) {
            Logger.getLogger(BQf.class.getName()).log(Level.SEVERE, null, ex);
           } 

    }




       // Open File
 
       String  myURL = "c:\\img\\pic.jpg" ;
       Desktop.getDesktop().open(new File( myURL ));


       // Open Folder
 
       String  myURL = "c:\\img" ;
       Desktop.getDesktop().open(new File( myURL ));

     
       OR 
 
       Desktop.getDesktop().open(new File(  "c:\\img" ));



      if open folder in project 





       Desktop.getDesktop().open(new File(  "img" ));